APA (7th ed.) Citation

Schlee, J. S. (1991). Our changing continent. [U.S. Dept. of the Interior, Geological Survey].

Chicago Style (17th ed.) Citation

Schlee, John S. Our Changing Continent. [Washington, D.C.?]: [U.S. Dept. of the Interior, Geological Survey], 1991.

MLA (9th ed.) Citation

Schlee, John S. Our Changing Continent. [U.S. Dept. of the Interior, Geological Survey], 1991.