APA (7th ed.) Citation

United States. National Planning Board. (1941). Land Classification in the United States. [publisher not identified].

Chicago Style (17th ed.) Citation

United States. National Planning Board. Land Classification in the United States. [Washington]: [publisher not identified], 1941.

MLA (9th ed.) Citation

United States. National Planning Board. Land Classification in the United States. [publisher not identified], 1941.

Warning: These citations may not always be 100% accurate.