Image: Vulcans Throne Nichols med00380

Description: Arizona Grand Canyon National Park, Arizona. Vulcan's Throne - a volcanic cone.
Title: Vulcans Throne Nichols med00380
Credit: http://libraryphoto.cr.usgs.gov/cgi-bin/show_picture.cgi?ID=ID.%20McKee,%20E.D.%20%20380ct
Author: E.T. Nichols, U.S. Geological Survey
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Usage Terms: Public domain
License: PD
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