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Updated May 18, 2026
Official State Soils of the United States
Quick Answer
What matters most
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1
State soils are official soil series designated by state legislatures to represent each state's land and agricultural heritage. Each is a distinct, scientifically classified soil series identified and named by USDA soil scientists.
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2
Nebraska's Holdrege series (1979) is one of the earliest state soils designated in the United States. Iowa's Tama and most others followed in the 1980s and 1990s. Montana's Scobey series was the most recently designated, in 2015.
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3
Texas's Houston Black covers over 10 million acres of the Blackland Prairie and cracks wide open in drought. You can see the gaps in the ground. Florida's Myakka covers millions of acres of pine flatwoods and is the most extensive soil in the state.
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4
The red color in many southeastern state soils (Alabama's Bama series, North Carolina's Cecil series) comes from iron oxides that built up over thousands of years of warm, wet weathering.
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5
Connecticut and Washington have proposed but not yet officially adopted state soils. All other states have formally designated one.
Map
U.S. State Soils
| State | State Soil |
|---|---|
| Alabama | Bama Soil Series |
| Alaska | Tanana Soil Series |
| Arizona | Casa Grande Soil Series |
| Arkansas | Stuttgart Soil Series |
| California | San Joaquin Soil Series |
| Colorado | Seitz Soil Series |
| Connecticut | Windsor Soil Series |
| Delaware | Greenwich Soil Series |
| Florida | Myakka Soil Series |
| Georgia | Tifton Soil Series |
| Hawaii | Hilo Soil Series |
| Idaho | Threebear Soil Series |
| Illinois | Drummer Soil Series |
| Indiana | Miami Soil Series |
| Iowa | Tama Soil Series |
| Kansas | Harney Soil Series |
| Kentucky | Crider Soil Series |
| Louisiana | Ruston Soil Series |
| Maine | Chesuncook Soil Series |
| Maryland | Sassafras Soil Series |
| Massachusetts | Paxton Soil Series |
| Michigan | Kalkaska Soil Series |
| Minnesota | Lester Soil Series |
| Mississippi | Natchez Soil Series |
| Missouri | Menfro Soil Series |
| Montana | Scobey Soil Series |
| Nebraska | Holdrege Soil Series |
| Nevada | Orovada Soil Series |
| New Hampshire | Marlow Soil Series |
| New Jersey | Downer Soil Series |
| New Mexico | Penistaja Soil Series |
| New York | Honeoye Soil Series |
| North Carolina | Cecil Soil Series |
| North Dakota | Williams Soil Series |
| Ohio | Miamian Soil Series |
| Oklahoma | Port Silt Loam Soil Series |
| Oregon | Jory Soil Series |
| Pennsylvania | Hazleton Soil Series |
| Rhode Island | Narragansett Soil Series |
| South Carolina | Bohicket Soil Series |
| South Dakota | Houdek Soil Series |
| Tennessee | Dickson Soil Series |
| Texas | Houston Black Soil Series |
| Utah | Mivida Soil Series |
| Vermont | Tunbridge Soil Series |
| Virginia | Pamunkey Soil Series |
| Washington | Tokul Soil Series |
| West Virginia | Monongahela Soil Series |
| Wisconsin | Antigo Soil Series |
| Wyoming | Forkwood Soil Series |
Official state soils designated by state legislatures. Connecticut and Washington have proposed but not yet formally adopted state soils.
List of US State Soils
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Showing all 50 entries
Alabama
State Soil:
Bama Soil Series
Adopted:
1997
Key Characteristic:
Deep red-brown subsoil stained by iron oxides; covers 360,000 acres across 26 counties on the Coastal Plain. The name Bama comes directly from Alabama.
Alaska
State Soil:
Tanana Soil Series
Key Characteristic:
Subarctic soils of the Tanana River valley in interior Alaska; formed under permafrost conditions that limit drainage and decomposition to a thin active layer.
Arizona
State Soil:
Casa Grande Soil Series
Adopted:
1997
Key Characteristic:
Desert soil with a cemented hardpan (duripan) layer that blocks root penetration; found across Pinal and Pima counties in Arizona's desert valleys.
Arkansas
State Soil:
Stuttgart Soil Series
Adopted:
1997
Key Characteristic:
Claypan soils of the Grand Prairie; the soil under Arkansas rice paddies, named for Stuttgart, the rice capital of Arkansas.
California
State Soil:
San Joaquin Soil Series
Adopted:
1997
Key Characteristic:
Central Valley hardpan soil with a cemented silica layer (duripan) that limits root depth; covers about 110,000 acres of California's interior valleys.
Colorado
State Soil:
Seitz Soil Series
Key Characteristic:
A deep, well-drained loamy soil of Colorado's mountain parks and high valleys; formed from glacial till and colluvium under subalpine conditions.
Connecticut
State Soil:
Windsor Soil Series
Key Characteristic:
Proposed state soil (not yet formally adopted). Excessively drained sandy glacial outwash; historically used for shade-grown broadleaf tobacco in the Connecticut River Valley.
Delaware
State Soil:
Greenwich Soil Series
Adopted:
2000
Key Characteristic:
Sandy, well-drained soils of the Delaware Coastal Plain; supports truck farming, grain, and soybeans across the Delmarva Peninsula.
Florida
State Soil:
Myakka Soil Series
Adopted:
1989
Key Characteristic:
Sandy flatwoods with a dark organic spodic layer just below the surface; the most extensive soil in Florida, covering millions of acres of pine flatwoods.
Georgia
State Soil:
Tifton Soil Series
Key Characteristic:
Well-drained loamy Coastal Plain soil; supports Georgia's peanut, cotton, and timber industries across the southern counties.
Hawaii
State Soil:
Hilo Soil Series
Key Characteristic:
Deep, well-drained volcanic soil (Andisol) formed from weathered basalt on the windward slopes of the Big Island; historically the foundation of Hawaii's sugarcane industry.
Idaho
State Soil:
Threebear Soil Series
Key Characteristic:
Deep, well-drained loamy soils of northern Idaho's forested mountains; formed from volcanic ash and loess over basalt bedrock.
Illinois
State Soil:
Drummer Soil Series
Adopted:
2001
Key Characteristic:
Poorly drained, very dark prairie soil with up to 6 percent organic matter; the most productive corn-growing soil in Illinois.
Indiana
State Soil:
Miami Soil Series
Key Characteristic:
Silt loam over calcareous glacial till; the primary soil under central Indiana's corn and soybean fields across the till plain.
Iowa
State Soil:
Tama Soil Series
Key Characteristic:
Deep, dark prairie Mollisol of the corn belt; one of the earliest state soils designated in the United States and a benchmark for corn yield potential.
Kansas
State Soil:
Harney Soil Series
Adopted:
1990
Key Characteristic:
Deep silty clay loam of the High Plains; the dominant soil under Kansas's winter wheat fields.
Kentucky
State Soil:
Crider Soil Series
Adopted:
1990
Key Characteristic:
Deep, well-drained silt loam formed from limestone residuum in western Kentucky; supports burley tobacco, corn, and soybeans on the Pennyroyal Plateau.
Louisiana
State Soil:
Ruston Soil Series
Key Characteristic:
Red loamy soils of north Louisiana's Coastal Plain uplands; supports pine forests and sweet potato farming across the region.
Maine
State Soil:
Chesuncook Soil Series
Adopted:
1999
Key Characteristic:
Deep, very poorly drained soil of Maine's northern boreal forests; named for Chesuncook Lake in Piscataquis County, formed from glacial till under spruce and fir.
Maryland
State Soil:
Sassafras Soil Series
Key Characteristic:
Well-drained sandy loam of the Coastal Plain; historically important for tobacco farming on Maryland's Eastern Shore and Delmarva Peninsula.
Massachusetts
State Soil:
Paxton Soil Series
Adopted:
1990
Key Characteristic:
Stony loam over dense glacial till; widespread through central Massachusetts, supporting apple orchards and dairy farms across the upland interior.
Michigan
State Soil:
Kalkaska Soil Series
Adopted:
1990
Key Characteristic:
Sandy, excessively drained, very acid soil of northern Michigan's jack pine and mixed forest lands; covers large areas of the northern Lower Peninsula.
Minnesota
State Soil:
Lester Soil Series
Adopted:
2012
Key Characteristic:
Deep loam at the prairie-forest transition zone; designated in 2012, representing Minnesota's productive mixed farming region in the southern and central counties.
Mississippi
State Soil:
Natchez Soil Series
Adopted:
2003
Key Characteristic:
Deep, well-drained silt loam on the loess bluffs of western Mississippi; named for the historic city and supports cotton, soybeans, and corn.
Missouri
State Soil:
Menfro Soil Series
Key Characteristic:
Well-drained silt loam on Missouri's loess hills; covers broad areas of the state's river bluff uplands and supports corn, soybean, and winter wheat production.
Montana
State Soil:
Scobey Soil Series
Adopted:
2015
Key Characteristic:
Deep, calcareous clay loam of the Northern Great Plains; named for Scobey in Daniels County and the most recently designated state soil in the United States (2015).
Nebraska
State Soil:
Holdrege Soil Series
Adopted:
1979
Key Characteristic:
Deep silt loam on Nebraska's Loess Hills; one of the earliest state soils designated (1979) and among the most productive soils for dryland wheat and corn.
Nevada
State Soil:
Orovada Soil Series
Adopted:
2001
Key Characteristic:
Loamy, calcareous soils of Nevada's high desert valleys; named for Orovada in Humboldt County and typical of the state's sagebrush rangelands.
New Hampshire
State Soil:
Marlow Soil Series
Key Characteristic:
Moderately deep, well-drained loamy soils over compact glacial till; widespread across New Hampshire's upland forests and small dairy farms.
New Jersey
State Soil:
Downer Soil Series
Key Characteristic:
Moderately well-drained sandy loam of the inner Coastal Plain; supports New Jersey's blueberry and vegetable industries in the Pine Barrens region.
New Mexico
State Soil:
Penistaja Soil Series
Key Characteristic:
Reddish loamy soils on the Colorado Plateau and mesas; typical of New Mexico's rangeland and pinyon-juniper woodland landscapes.
New York
State Soil:
Honeoye Soil Series
Key Characteristic:
Deep silt loam over limestone-rich glacial till; the primary soil of the Finger Lakes wine region and western New York dairy country.
North Carolina
State Soil:
Cecil Soil Series
Key Characteristic:
Deep red clay subsoil of the Piedmont; covers millions of acres under North Carolina's tobacco, cotton, and timber lands, one of the most widespread soils in the Southeast.
North Dakota
State Soil:
Williams Soil Series
Key Characteristic:
Deep calcareous loam of the Northern Great Plains; the dominant soil under North Dakota's wheat and sunflower fields.
Ohio
State Soil:
Miamian Soil Series
Key Characteristic:
Silt loam over limestone-rich glacial till in western Ohio; the primary soil under corn, soybeans, and hay across the Miami Valley.
Oklahoma
State Soil:
Port Silt Loam Soil Series
Adopted:
1987
Key Characteristic:
Deep silty alluvial soils of the Red River bottoms; supports cotton, winter wheat, and row crops in southern Oklahoma, designated in 1987.
Oregon
State Soil:
Jory Soil Series
Adopted:
2011
Key Characteristic:
Deep reddish-brown volcanic soils of the Willamette Valley; the foundation of Oregon's Pinot Noir wine region and nursery industry. Officially designated in 2011.
Pennsylvania
State Soil:
Hazleton Soil Series
Key Characteristic:
Stony, shallow soils over sandstone on the Appalachian Plateau; covers much of Pennsylvania's forested ridges and mountain terrain.
Rhode Island
State Soil:
Narragansett Soil Series
Key Characteristic:
Well-drained loamy soils over glacial till; named for Narragansett Bay and found across Rhode Island's agricultural uplands and historic farm country.
South Carolina
State Soil:
Bohicket Soil Series
Key Characteristic:
Tidal marsh soils of the South Carolina coast; one of the most unusual state soils, chosen not for agricultural productivity but for the ecological and cultural significance of the Lowcountry marshes.
South Dakota
State Soil:
Houdek Soil Series
Adopted:
1990
Key Characteristic:
Deep calcareous loam of the Coteau des Prairies; supports wheat farming and cattle ranching in eastern South Dakota.
Tennessee
State Soil:
Dickson Soil Series
Key Characteristic:
Fragipan soils of the Highland Rim; widespread through middle Tennessee's tobacco, corn, and row-crop farmland.
Texas
State Soil:
Houston Black Soil Series
Key Characteristic:
Deep black Vertisol of the Blackland Prairie; shrinks and cracks in drought, swells when wet, the expansive clay underlying Houston's famously unstable building foundations.
Utah
State Soil:
Mivida Soil Series
Key Characteristic:
Deep, well-drained loamy soils of the canyon country of southeastern Utah; formed from sandstone and shale residuum under sparse desert shrub and pinyon-juniper.
Vermont
State Soil:
Tunbridge Soil Series
Adopted:
1985
Key Characteristic:
Shallow to moderately deep stony soils over schist and gneiss; typical of Vermont's upland dairy farms and maple sugar forests.
Virginia
State Soil:
Pamunkey Soil Series
Key Characteristic:
Deep loamy alluvial soils of the Virginia Piedmont and Coastal Plain; named for the Pamunkey River and historically important for tobacco farming.
Washington
State Soil:
Tokul Soil Series
Key Characteristic:
Proposed state soil (not yet formally adopted). Deep reddish soils formed from volcanic ash over glacial outwash; supports tree fruit orchards and timber in western Washington.
West Virginia
State Soil:
Monongahela Soil Series
Adopted:
1997
Key Characteristic:
Silt loam soils on old river terraces of the Monongahela and Ohio river systems; supports corn, hay, and mixed farming across the state's river valleys.
Wisconsin
State Soil:
Antigo Soil Series
Adopted:
1983
Key Characteristic:
Sandy loam over loam in northern Wisconsin; the primary soil under the dairy farms and mixed forests of the northwoods.
Wyoming
State Soil:
Forkwood Soil Series
Key Characteristic:
Deep, well-drained loamy soils of the High Plains and Wyoming basins; typical of the state's sagebrush steppe and rangeland used for cattle and sheep grazing.
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|
Photo
|
State
|
State Soil
|
Adopted
|
Key Characteristic
|
|---|---|---|---|---|
|
Alabama
|
Bama Soil Series | 1997 | Deep red-brown subsoil stained by iron oxides; covers 360,000 acres across 26 counties on the Coastal Plain. The name Bama comes directly from Alabama. |
|
Alaska
|
Tanana Soil Series | — | Subarctic soils of the Tanana River valley in interior Alaska; formed under permafrost conditions that limit drainage and decomposition to a thin active layer. |
|
Arizona
|
Casa Grande Soil Series | 1997 | Desert soil with a cemented hardpan (duripan) layer that blocks root penetration; found across Pinal and Pima counties in Arizona's desert valleys. |
|
Arkansas
|
Stuttgart Soil Series | 1997 | Claypan soils of the Grand Prairie; the soil under Arkansas rice paddies, named for Stuttgart, the rice capital of Arkansas. |
|
California
|
San Joaquin Soil Series | 1997 | Central Valley hardpan soil with a cemented silica layer (duripan) that limits root depth; covers about 110,000 acres of California's interior valleys. |
|
Colorado
|
Seitz Soil Series | — | A deep, well-drained loamy soil of Colorado's mountain parks and high valleys; formed from glacial till and colluvium under subalpine conditions. |
|
Connecticut
|
Windsor Soil Series | — | Proposed state soil (not yet formally adopted). Excessively drained sandy glacial outwash; historically used for shade-grown broadleaf tobacco in the Connecticut River Valley. |
|
Delaware
|
Greenwich Soil Series | 2000 | Sandy, well-drained soils of the Delaware Coastal Plain; supports truck farming, grain, and soybeans across the Delmarva Peninsula. |
|
Florida
|
Myakka Soil Series | 1989 | Sandy flatwoods with a dark organic spodic layer just below the surface; the most extensive soil in Florida, covering millions of acres of pine flatwoods. |
|
Georgia
|
Tifton Soil Series | — | Well-drained loamy Coastal Plain soil; supports Georgia's peanut, cotton, and timber industries across the southern counties. |
|
Hawaii
|
Hilo Soil Series | — | Deep, well-drained volcanic soil (Andisol) formed from weathered basalt on the windward slopes of the Big Island; historically the foundation of Hawaii's sugarcane industry. |
|
Idaho
|
Threebear Soil Series | — | Deep, well-drained loamy soils of northern Idaho's forested mountains; formed from volcanic ash and loess over basalt bedrock. |
|
Illinois
|
Drummer Soil Series | 2001 | Poorly drained, very dark prairie soil with up to 6 percent organic matter; the most productive corn-growing soil in Illinois. |
|
Indiana
|
Miami Soil Series | — | Silt loam over calcareous glacial till; the primary soil under central Indiana's corn and soybean fields across the till plain. |
|
Iowa
|
Tama Soil Series | — | Deep, dark prairie Mollisol of the corn belt; one of the earliest state soils designated in the United States and a benchmark for corn yield potential. |
|
Kansas
|
Harney Soil Series | 1990 | Deep silty clay loam of the High Plains; the dominant soil under Kansas's winter wheat fields. |
|
Kentucky
|
Crider Soil Series | 1990 | Deep, well-drained silt loam formed from limestone residuum in western Kentucky; supports burley tobacco, corn, and soybeans on the Pennyroyal Plateau. |
|
Louisiana
|
Ruston Soil Series | — | Red loamy soils of north Louisiana's Coastal Plain uplands; supports pine forests and sweet potato farming across the region. |
|
Maine
|
Chesuncook Soil Series | 1999 | Deep, very poorly drained soil of Maine's northern boreal forests; named for Chesuncook Lake in Piscataquis County, formed from glacial till under spruce and fir. |
|
Maryland
|
Sassafras Soil Series | — | Well-drained sandy loam of the Coastal Plain; historically important for tobacco farming on Maryland's Eastern Shore and Delmarva Peninsula. |
|
Massachusetts
|
Paxton Soil Series | 1990 | Stony loam over dense glacial till; widespread through central Massachusetts, supporting apple orchards and dairy farms across the upland interior. |
|
Michigan
|
Kalkaska Soil Series | 1990 | Sandy, excessively drained, very acid soil of northern Michigan's jack pine and mixed forest lands; covers large areas of the northern Lower Peninsula. |
|
Minnesota
|
Lester Soil Series | 2012 | Deep loam at the prairie-forest transition zone; designated in 2012, representing Minnesota's productive mixed farming region in the southern and central counties. |
|
Mississippi
|
Natchez Soil Series | 2003 | Deep, well-drained silt loam on the loess bluffs of western Mississippi; named for the historic city and supports cotton, soybeans, and corn. |
|
Missouri
|
Menfro Soil Series | — | Well-drained silt loam on Missouri's loess hills; covers broad areas of the state's river bluff uplands and supports corn, soybean, and winter wheat production. |
|
Montana
|
Scobey Soil Series | 2015 | Deep, calcareous clay loam of the Northern Great Plains; named for Scobey in Daniels County and the most recently designated state soil in the United States (2015). |
|
Nebraska
|
Holdrege Soil Series | 1979 | Deep silt loam on Nebraska's Loess Hills; one of the earliest state soils designated (1979) and among the most productive soils for dryland wheat and corn. |
|
Nevada
|
Orovada Soil Series | 2001 | Loamy, calcareous soils of Nevada's high desert valleys; named for Orovada in Humboldt County and typical of the state's sagebrush rangelands. |
|
New Hampshire
|
Marlow Soil Series | — | Moderately deep, well-drained loamy soils over compact glacial till; widespread across New Hampshire's upland forests and small dairy farms. |
|
New Jersey
|
Downer Soil Series | — | Moderately well-drained sandy loam of the inner Coastal Plain; supports New Jersey's blueberry and vegetable industries in the Pine Barrens region. |
|
New Mexico
|
Penistaja Soil Series | — | Reddish loamy soils on the Colorado Plateau and mesas; typical of New Mexico's rangeland and pinyon-juniper woodland landscapes. |
|
New York
|
Honeoye Soil Series | — | Deep silt loam over limestone-rich glacial till; the primary soil of the Finger Lakes wine region and western New York dairy country. |
|
North Carolina
|
Cecil Soil Series | — | Deep red clay subsoil of the Piedmont; covers millions of acres under North Carolina's tobacco, cotton, and timber lands, one of the most widespread soils in the Southeast. |
|
North Dakota
|
Williams Soil Series | — | Deep calcareous loam of the Northern Great Plains; the dominant soil under North Dakota's wheat and sunflower fields. |
|
Ohio
|
Miamian Soil Series | — | Silt loam over limestone-rich glacial till in western Ohio; the primary soil under corn, soybeans, and hay across the Miami Valley. |
|
Oklahoma
|
Port Silt Loam Soil Series | 1987 | Deep silty alluvial soils of the Red River bottoms; supports cotton, winter wheat, and row crops in southern Oklahoma, designated in 1987. |
|
Oregon
|
Jory Soil Series | 2011 | Deep reddish-brown volcanic soils of the Willamette Valley; the foundation of Oregon's Pinot Noir wine region and nursery industry. Officially designated in 2011. |
|
Pennsylvania
|
Hazleton Soil Series | — | Stony, shallow soils over sandstone on the Appalachian Plateau; covers much of Pennsylvania's forested ridges and mountain terrain. |
|
Rhode Island
|
Narragansett Soil Series | — | Well-drained loamy soils over glacial till; named for Narragansett Bay and found across Rhode Island's agricultural uplands and historic farm country. |
|
South Carolina
|
Bohicket Soil Series | — | Tidal marsh soils of the South Carolina coast; one of the most unusual state soils, chosen not for agricultural productivity but for the ecological and cultural significance of the Lowcountry marshes. |
|
South Dakota
|
Houdek Soil Series | 1990 | Deep calcareous loam of the Coteau des Prairies; supports wheat farming and cattle ranching in eastern South Dakota. |
|
Tennessee
|
Dickson Soil Series | — | Fragipan soils of the Highland Rim; widespread through middle Tennessee's tobacco, corn, and row-crop farmland. |
|
Texas
|
Houston Black Soil Series | — | Deep black Vertisol of the Blackland Prairie; shrinks and cracks in drought, swells when wet, the expansive clay underlying Houston's famously unstable building foundations. |
|
Utah
|
Mivida Soil Series | — | Deep, well-drained loamy soils of the canyon country of southeastern Utah; formed from sandstone and shale residuum under sparse desert shrub and pinyon-juniper. |
|
Vermont
|
Tunbridge Soil Series | 1985 | Shallow to moderately deep stony soils over schist and gneiss; typical of Vermont's upland dairy farms and maple sugar forests. |
|
Virginia
|
Pamunkey Soil Series | — | Deep loamy alluvial soils of the Virginia Piedmont and Coastal Plain; named for the Pamunkey River and historically important for tobacco farming. |
|
Washington
|
Tokul Soil Series | — | Proposed state soil (not yet formally adopted). Deep reddish soils formed from volcanic ash over glacial outwash; supports tree fruit orchards and timber in western Washington. |
|
West Virginia
|
Monongahela Soil Series | 1997 | Silt loam soils on old river terraces of the Monongahela and Ohio river systems; supports corn, hay, and mixed farming across the state's river valleys. |
|
Wisconsin
|
Antigo Soil Series | 1983 | Sandy loam over loam in northern Wisconsin; the primary soil under the dairy farms and mixed forests of the northwoods. |
|
Wyoming
|
Forkwood Soil Series | — | Deep, well-drained loamy soils of the High Plains and Wyoming basins; typical of the state's sagebrush steppe and rangeland used for cattle and sheep grazing. |
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Section
How the State Soil Program Started
The state soil program began taking shape in the 1980s, pushed by the Soil Science Society of America. The idea was simple: give each state an official soil the way states have an official bird or flower. Nebraska was the first, designating the Holdrege series in 1979. Most other states followed through the 1980s and 1990s.
The USDA Natural Resources Conservation Service, the federal agency that maps and classifies American soils, provided the scientific backbone. Each nominated soil already had a complete official description: where it was first found, what it looks like layer by layer, and how far it spreads across the state.
Montana was last, officially designating the Scobey series in 2015. Connecticut and Washington have proposed state soils but have not yet passed them into law.
Section
Official State Soils of All 50 States
The table below lists every state soil with its adoption year and key characteristic. Names come from the town or county where the soil was first studied and described.
Connecticut and Washington have officially proposed state soils that have not yet been formally adopted. Puerto Rico (Bayamon) and the U.S. Virgin Islands (Victory) also have official territorial soils.
Methodology
How we researched this list
Adoption years reflect the year of official legislative designation, as recorded by the Soil Science Society of America and USDA NRCS. Years marked as proposed indicate a recommendation that has not been enacted into law. States with no confirmed adoption year are listed without one.
Sources
Sources & references
-
1
Wikipedia, List of U.S. state soils
State soil designations with adoption years.
https://en.wikipedia.org/wiki/List_of_U.S._state_soils
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