1927. 2011-05-17T19:27:19Z. 2015-10-21T14:59:22Z. Geological Survey (U.S.). The Survey. English. Public. Archuleta County (Colo.), Hinsdale County (Colo.), La Plata County (Colo.), and Mineral County (Colo.).
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1927. 2011-05-17T19:28:04Z. 2015-10-21T14:59:22Z. Geological Survey (U.S.). The Survey. English. Public. Archuleta County (Colo.), Hinsdale County (Colo.), La Plata County (Colo.), and Mineral County (Colo.).
1927. 2011-05-13T14:51:30Z. 2021-05-19T18:04:38Z. Geological Survey (U.S.). The Survey. English. Public. Kamishak Bay Region (Alaska) and Katmai National Park and Preserve Region (Alaska).
1927. 2011-01-05T20:37:10Z. 2015-04-16T18:06:51Z. Geological Survey (U.S.). The Survey. English. Public. Tennessee.
1927. 2010-12-17T19:40:25Z. 2015-10-21T15:18:50Z. Geological Survey (U.S.). The Survey. English. Public. Mississippi.
1927. 2018-04-03T19:46:11Z. 2018-04-03T19:47:32Z. Geological Survey (U.S.). The Survey. English. cartographic image. Public. Grand Canyon National Park (Ariz.), United States, Arizona, Grand Canyon National Park., and United States.
1927. 2002-06-01T04:00:00Z. 2015-10-27T22:18:19Z. Geological Survey (U.S.). The Survey. English. Public. Grand Canyon National Park (Ariz.).
1927. 2002-06-25T04:00:00Z. 2015-10-27T22:19:23Z. Geological Survey (U.S.). The Survey. English. Public. Sequoia National Park (Calif.) and General Grant National Park (Calif.).
1927. 2011-05-27T19:56:36Z. 2015-10-21T15:00:04Z. Geological Survey (U.S.). The Survey. English. Public. Bland County (Va.), Dublin Region (Va.), Giles County (Va.), Montgomery County (Va.), Pulaski County (Va.), Virginia, and West Virginia.
