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.).
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1891. 2011-05-17T18:29:36Z. 2015-10-21T14:59:21Z. Geological Survey (U.S.). The Survey. English. Public. Chaffee County (Colo.), Eagle County (Colo.), Lake County (Colo.), Park County (Colo.), Pitkin County (Colo.), and Summit County (Colo.).
1911. 2011-05-17T19:20:44Z. 2015-10-21T14:59:22Z. Geological Survey (U.S.). The Survey. English. Public. Chaffee County (Colo.), Eagle County (Colo.), Gunnison County (Colo.), Lake County (Colo.), and Pitkin County (Colo.).