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![](./img/clear.gif) 1.- Geology of the Chesapeake and Ohio Canal National Historical Park and Potomac River Corridor, District of Columbia, Maryland, West Virginia, and Virginia
Southworth, Scott; Brezinski, David K.; Orndorff, Randall C; Repetski, John E.; Denenny, Danielle M.
Reston (Virginia): U.S. Geological Survey, 2008
U.S. Geological Survey Professional Paper
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