Soil Survey of Iowa, Report No . 77—Washington County Soils

Washington County is located in southeastern Iowa in the second tier of counties west of the Mississippi River and in the third tier north of the Missouri state line. It lies partly in the Mississippi loess and partly in the Southern Iowa loess soil areas and hence the soils are all of loessial origin

Soil Survey of Iowa, Report No. 78—Monroe County Soils

Monroe County is located in southern Iowa in the second tier of counties north of the Missouri state line and in the fourth tier west of the Mississippi River. It is entirely within the Southern Iowa loess soil area and the soils are, therefore, practically all of loessial origin. The only drift soils found are those derived from the old Kansan till which has been exposed through the erosion or washing away of the loessial covering

Soil Survey of Iowa, Report No. 71—Sac County Soils

Sac County is located in the northwestern part of Iowa, in the fourth tier of counties south of the Minnesota state line and in the third tier east of the Missouri River. It is partly in the Wisconsin drift soil area and partly in the Missouri loess area. The soils of the county are partly of glacial and partly of loessial origin

Soil Survey of Iowa, Report No. 75—Guthrie County Soils

Guthrie County is located in the west central part of Iowa, in the fourth tier of counties north of the Missouri state line and in the fourth tier east of the Missouri River. It is partly in the Wisconsin drift soil area and partly in the Mississippi loess, the Missouri loess and the Southern Iowa loess soil areas. The soils are, therefore, partly of glacial origin and partly of loessial origin, loess types representing all three loess areas occurring in the county