1922. 2011-05-17T15:44:20Z. 2015-10-21T14:59:19Z. Geological Survey (U.S.). The Survey. English. Public. Archuleta County (Colo.), Conejos County (Colo.), and Rio Grande County (Colo.).
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1916. 2011-05-17T16:45:13Z. 2015-10-21T14:59:19Z. Geological Survey (U.S.). The Survey. English. Public. Mineral County (Colo.), Rio Grande County (Colo.), and Saguache County (Colo.).
1917. 2011-05-17T20:10:54Z. 2015-10-21T14:59:25Z. Geological Survey (U.S.). The Survey. English. Public. Alamosa County (Colo.), Rio Grande County (Colo.), and Saguache County (Colo.).
1930. 2011-05-17T17:13:18Z. 2015-10-21T14:59:20Z. Geological Survey (U.S.). The Survey. English. Public. Eagle County (Colo.), Garfield County (Colo.), Rio Grande County (Colo.), and Routt County (Colo.).
1915. 2011-05-18T14:03:45Z. 2015-10-21T14:59:26Z. Geological Survey (U.S.). The Survey. English. Public. Archuleta County (Colo.), Conejos County (Colo.), Mineral County (Colo.), and Rio Grande County (Colo.).