APA (7th ed.) Citation

Geological Survey (U.S.). (1983). Guide to USGS geologic and hydrologic maps. Documents Index.

Chicago Style (17th ed.) Citation

Geological Survey (U.S.). Guide to USGS Geologic and Hydrologic Maps. McLean, Va.: Documents Index, 1983.

MLA (9th ed.) Citation

Geological Survey (U.S.). Guide to USGS Geologic and Hydrologic Maps. Documents Index, 1983.

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