1. Percent change in the value of farm products sold per acre of land in farms : by counties of the United States, 1939-1964 Author/Creator: United States. Bureau of the Census. Geography Division, cartographer Publication/Creation: Washington, D.C. : For sale by the Superintendent of Documents, U.S. Government Printing Office, 1970 Resource Type: Map Access & Availability: Loading
2. Value of farm products sold per acre of land in farms, by counties of the United States, 1964 Author/Creator: United States. Bureau of the Census, cartographer Publication/Creation: Washington, D.C. : U.S. Government Printing Office, 1970 Resource Type: Map Access & Availability: Loading