APA (7th ed.) Citation

Billingsley, G. H. (2019). Geologic field photograph map of the Grand Canyon Region, 1967-2010. U.S. Department of the Interior, U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Billingsley, George H. Geologic Field Photograph Map of the Grand Canyon Region, 1967-2010. Reston, Virginia: U.S. Department of the Interior, U.S. Geological Survey, 2019.

MLA (9th ed.) Citation

Billingsley, George H. Geologic Field Photograph Map of the Grand Canyon Region, 1967-2010. U.S. Department of the Interior, U.S. Geological Survey, 2019.