1940. Parvis, M. Blueline. 'Prepared under the supervision of: M. Parvis.' Scale approximately 1:63,360. By State Highway Commission of Indiana at Purdue University. State Highway Commission of Indiana.
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1940. Color reproduction by Bureau of Agricultural Economics, U.S.D.A.' '8-31-40.' Includes chart showing type of land use, acreage, and recommended use.... United States Bureau of Agricultural Economics.