1893. 2003-07-17T11:59:38Z. 2016-11-29T22:12:15Z. Geological Survey (U.S.). U.S. Geological Survey. English. Public. Washington (D.C.) and Washington Metropolitan Area.
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1891. 2010-09-09T13:43:45Z. 2015-10-27T22:25:38Z. Geological Survey (U.S.). U.S. Geological Survey. English. Public. Washington (D.C.) and Washington Metropolitan Area.
1895. 2010-09-09T13:41:57Z. 2015-10-27T22:25:38Z. Geological Survey (U.S.). U.S. Geological Survey. English. Public. Washington Metropolitan Area.
1901. 2003-07-16T14:52:28Z. 2015-10-27T22:20:38Z. Darton, Nelson Horatio, 1865-1948. U.S. Geological Survey. English. Public. Washington (D.C.) and Washington Metropolitan Area.
1900. 2010-09-08T20:15:08Z. 2015-10-27T22:25:38Z. Geological Survey (U.S.). U.S. Geological Survey. English. Public. Washington Metropolitan Area and Washington (D.C.).
1898. 2010-09-09T13:39:59Z. 2015-10-27T22:25:38Z. Geological Survey (U.S.). U.S. Geological Survey. English. Public. Washington Metropolitan Area.