APA (7th ed.) Citation

United States. Soil Conservation Service. (1971). 2/3 of our land: A national inventory. [publisher not identified].

Chicago Style (17th ed.) Citation

United States. Soil Conservation Service. 2/3 of Our Land: A National Inventory. [Washington]: [publisher not identified], 1971.

MLA (9th ed.) Citation

United States. Soil Conservation Service. 2/3 of Our Land: A National Inventory. [publisher not identified], 1971.