1969. 2012-02-22T19:31:06Z. 2012-02-22T19:31:06Z. Bryant, Bruce, 1930-. The Survey. English. Public. Colorado, Pitkin County, and Gunnison County.
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1969. 2012-02-28T16:03:29Z. 2012-02-28T16:03:29Z. Kent, Bion H. (Bion Huntley), 1925-. Geological Survey. English. Public. Pennsylvania, Greene County, and Washington County.
1969. 2012-02-28T16:44:22Z. 2012-02-28T16:44:22Z. Cullins, Henry L. The Survey. English. Public. Colorado, Rio Blanco County, and Moffat County.
1969. 2012-10-11T18:50:00Z. 2012-10-11T18:50:00Z. Monroe, Watson Hiner, 1907-1992. The Survey. English. Public. Puerto Rico.
1969. 2012-02-22T14:16:27Z. 2012-02-22T14:16:27Z. Franklin, George J. U.S. Geological Survey. English. Public. Kentucky, Webster County, and Hopkins County.
1969. 2012-02-28T16:40:36Z. 2012-02-28T16:40:36Z. Gable, Dolores J., 1922-. The Survey. English. Public. Colorado, Boulder County, and Gilpin County.
1969. 2012-02-27T16:01:06Z. 2019-10-07T16:54:03Z. Geological Survey (U.S.). U.S. Geological Survey. English. Public. Nevada and Nye County.
1969. 2012-02-23T15:51:38Z. 2021-05-28T17:49:18Z. Geological Survey (U.S.). The Survey. English. Public. Kentucky, Garrard County, and Madison County.
1969. 2012-02-28T16:15:22Z. 2012-02-28T16:15:22Z. Cattermole, J. Mark (John Mark), 1908-. The Survey. English. Public. South Dakota and Pennington County.
1969. 2012-02-23T14:36:02Z. 2012-02-23T14:36:02Z. Pratt, Walden P. The Survey. English. Public. Colorado, Dolores County, and Montezuma County.