Simmons, Charles S.
- A.C. Cline Correspondence: Simmons, C. S.. 1939-1941
- A.C. Cline Correspondence: United States Department of Agriculture - Soil Survey. 1939-1940
- Prospect Hill 1941 Soil Survey. 1941
- Slab City Soils Map - 1940. 1940
- Soil Map - Lands owned by the Yale School of Forestry, Keene and Swanzey, NH. 1953
- Soil survey of the Harvard Forest - Prospect Hill, Slab City, Tom Swamp Blocks with updated comments by Lyford. 1941