Soil Survey Maps Douglas County, Illinois United States. Department of Agriculture Published: 1969 Total Pages: Get eBook
Soil Survey of Douglas County, Illinois United States. Soil Conservation Service Published: 1971 Total Pages: 131 Get eBook
Soil Survey of Edwards and Richland Counties, Illinois D. C. Hallbick Published: 1971 Total Pages: 81 Get eBook
Soil Survey of Douglas County, Minnesota Donald E. DeMartelaere Published: 1975 Total Pages: 258 Get eBook