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1976. 2013-05-09T20:18:22Z. 2013-05-22T15:00:00Z. Brown, S. G. (Stuart G.), 1922-. U.S. Geological Survey. English. Public. Arizona and Tucson Region.
1976. 2013-09-11T18:51:35Z. 2021-10-01T21:34:19Z. Moore, Richard B. (Richard Beresford), 1945-. U.S. Geological Survey. English. Public. Arizona, San Francisco Volcanic Field, Coconino County, and U.S.
1976. 2018-04-03T19:31:24Z. 2018-04-03T19:31:24Z. Grand Canyon Natural History Association. The Association. English. cartographic image. Public. Arizona, Grand Canyon National Park, and Grand Canyon National Park.
1976. 2013-05-22T15:27:26Z. 2013-06-13T15:35:33Z. Osterkamp, W. R. U.S. Geological Survey. English. Public. Arizona and Phoenix Region.
1976. 2013-05-14T19:43:07Z. 2013-05-22T15:02:36Z. Moore, Richard T. U.S. Geological Survey. English. Public. Arizona and Phoenix Region.
