T. H. Benton

• Soil survey of Wright County, Iowa
• Soil survey Audubon county Iowa
• Soil survey of Buchanan County, Iowa
• Soil survey of Clayton County, Iowa
• Soil survey of Crawford County, Iowa
• Soil survey of Franklin county, Iowa
• Soil survey of Harrison County, Iowa
• Soil survey of Ida county, Iowa
• Soil survey of Poweshiek County, Iowa