1911. 2011-05-17T19:13:27Z. 2015-10-21T14:59:22Z. Geological Survey (U.S.). The Survey. English. Public. Gunnison County (Colo.), Hinsdale County (Colo.), MontroseCounty (Colo.), Ouray County (Colo.), and San Miguel County (Colo.).
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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.).
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.).
1930. 2011-05-18T13:20:45Z. 2015-10-21T14:59:26Z. Geological Survey (U.S.). The Survey. English. Public. Hinsdale County (Colo.), La Plata County (Colo.), Mineral County (Colo.), and San Juan County (Colo.).
1907. 2011-05-18T13:32:37Z. 2015-10-21T14:59:26Z. Geological Survey (U.S.). The Survey. English. Public. Hinsdale County (Colo.), La Plata County (Colo.), Mineral County (Colo.), and San Juan County (Colo.).
1911. 2011-05-18T14:47:21Z. 2015-10-21T14:59:26Z. Geological Survey (U.S.). The Survey. English. Public. Gunnison County (Colo.), Hinsdale County (Colo.), Montrose County (Colo.), and Saguache County (Colo.).