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Geology of the National Capital Region : field trip guidebook / edited by Scott Southworth and William Burton.
Web resource
Reston, Va. : U.S. Dept. of the Interior, U.S. Geological Survey, 2004.
2004
1 resource
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Web resource
Reston, Va. : U.S. Dept. of the Interior, U.S. Geological Survey, 2004.
2004
1 resource