Image: Bottomless Pit Rio de Flag Flagstaff
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Description: Water flowing in the 'bottomless pit', a limestone sinkhole drain, near Flagstaff in c. 1915
Title: Bottomless Pit Rio de Flag Flagstaff
Credit: https://blog.azgs.arizona.edu/blog/2019-06/new-publication-explores-origin-and-geology-rio-de-flag-flagstaff-arizona
Author: A. E. Hackett
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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