APA (7th ed.) Citation

Billingsley, G. H. (2000). Geologic map of the Grand Canyon 30ʹ x 60ʹ quadrangle, Coconino and Mohave Counties, northwestern Arizona (Version 1.0, last modified Nov. 21, 2000.). The Survey.

Chicago Style (17th ed.) Citation

Billingsley, George H. Geologic Map of the Grand Canyon 30ʹ X 60ʹ Quadrangle, Coconino and Mohave Counties, Northwestern Arizona. Version 1.0, last modified Nov. 21, 2000. [Reston, Va.]: The Survey, 2000.

MLA (9th ed.) Citation

Billingsley, George H. Geologic Map of the Grand Canyon 30ʹ X 60ʹ Quadrangle, Coconino and Mohave Counties, Northwestern Arizona. Version 1.0, last modified Nov. 21, 2000. The Survey, 2000.