By: callanbentley
Image: USGS
License: Public Domain

Uploaded: 21 Apr 2020
Last Updated: 21 Apr 2020

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Billingsley, G.H., and Hampton, H.M., 2000, Geologic map of the Grand Canyon 30' X 60' quadrangle, Coconino and Mohave Counties, northwestern Arizona: U.S. Geological Survey, Geologic Investigations Series Map I-2688, scale 1:100,000.