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2. Mount Vernon and Piscataway quadrangles, geologic and environmental atlas [cartographic material]
1978. 2016-06-21T13:24:02Z. 2016-09-26T17:42:50Z. Glaser, John D. State of Md., Dept. of Natural Resources, Md. Geological Survey, Williams & Heintz Map Corp.). English. cartographic image. Public. Maryland and Piscataway Region.
1978. 2012-06-27T12:32:56Z. 2012-07-05T13:03:54Z. Geological Survey (U.S.). The Survey. English. Public. Maryland and Virginia.
1978. 2012-08-08T14:54:21Z. 2013-03-18T22:10:12Z. Geological Survey (U.S.). The Survey. English. Public. Maryland.
1978. 2012-08-07T14:34:55Z. 2013-03-18T22:10:02Z. Geological Survey (U.S.). The Survey. English. Public. Maryland.