APA (7th ed.) Citation

Gehrels, G. E., & Berg, H. C. (2006). Preliminary integrated geologic map databases for the United States (Version 1.0.). U.S. Dept. of the Interior, U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Gehrels, George E., and Henry C. Berg. Preliminary Integrated Geologic Map Databases for the United States. Version 1.0. [Anchorage, Alaska]: U.S. Dept. of the Interior, U.S. Geological Survey, 2006.

MLA (9th ed.) Citation

Gehrels, George E., and Henry C. Berg. Preliminary Integrated Geologic Map Databases for the United States. Version 1.0. U.S. Dept. of the Interior, U.S. Geological Survey, 2006.