APA (7th ed.) Citation

Lobeck, A. K. (1941). Geologic map of the United States. Geographical Press.

Chicago Style (17th ed.) Citation

Lobeck, A. K. Geologic Map of the United States. New York: Geographical Press, 1941.

MLA (9th ed.) Citation

Lobeck, A. K. Geologic Map of the United States. Geographical Press, 1941.

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