APA (7th ed.) Citation

Geological Survey (U.S.). (2001). Map indexes available from the U.S. Geological Survey. U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Geological Survey (U.S.). Map Indexes Available from the U.S. Geological Survey. [Reston, Va.]: U.S. Geological Survey, 2001.

MLA (9th ed.) Citation

Geological Survey (U.S.). Map Indexes Available from the U.S. Geological Survey. U.S. Geological Survey, 2001.

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