APA (7th ed.) Citation

Geological Survey (U.S.). (2000). Map scales. [U.S. Dept. of the Interior, U.S. Geological Survey].

Chicago Style (17th ed.) Citation

Geological Survey (U.S.). Map Scales. [Reston, Va.]: [U.S. Dept. of the Interior, U.S. Geological Survey], 2000.

MLA (9th ed.) Citation

Geological Survey (U.S.). Map Scales. [U.S. Dept. of the Interior, U.S. Geological Survey], 2000.