1. sheet of National atlas of United States: Published soil surveys, July 1, 1960. Scale 1:10.000.000. 500 m-3 in. Beltsville, Md., 1960. Bookmark Corporate/Agency Authors: Soil Conservation Service and Agriculture Dept. Publisher: Soil Conservation Service Date: [November 1960] SuDoc number: A 57.23/2:So 3