1974. 2013-06-13T20:26:25Z. 2013-06-26T19:51:19Z. Geological Survey (U.S.). Dept. of the Interior, U.S. Geological Survey. English. Public. Washington (D.C.) and Washington Metropolitan Area.
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1974. 2013-06-13T20:27:10Z. 2013-06-26T19:51:19Z. Geological Survey (U.S.). Dept. of the Interior, U.S. Geological Survey. English. Public. Washington (D.C.) and Washington Metropolitan Area.
1978. 2013-06-14T17:35:44Z. 2013-06-26T19:51:24Z. Geological Survey (U.S.). Dept. of the Interior, U.S. Geological Survey. English. Public. Washington (D.C.) and Washington Metropolitan Area.
1978. 2013-06-14T17:33:21Z. 2013-06-26T19:51:24Z. Geological Survey (U.S.). Dept. of the Interior, U.S. Geological Survey. English. Public. Washington (D.C.) and Washington Metropolitan Area.
1975. 2013-06-13T20:33:25Z. 2013-06-26T19:51:19Z. Geological Survey (U.S.). Dept. of the Interior, U.S. Geological Survey. English. Public. Washington Metropolitan Area and Washington (D.C.).
1974. 2013-06-13T20:24:25Z. 2013-06-26T19:51:19Z. Geological Survey (U.S.). Dept. of the Interior, U.S. Geological Survey. English. Public. Washington Metropolitan Area and Washington (D.C.).
1882. 2003-07-16T14:55:15Z. 2020-08-20T20:42:35Z. Geological Survey (U.S.). s.n. English. Public. Washington Region and Washington Metropolitan Area.
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.
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.