1. Geology of the Chesapeake and Ohio Canal National Historical Park and Potomac River Corridor, District of Columbia, Maryland, West Virginia, and Virginia [electronic resource] Yale Public content 2001. 2006-07-17T20:25:07Z. 2023-02-14T22:53:20Z. Geological Survey (U.S.). U.S. Dept. of the Interior, U.S. Geological Survey. English. Public. Chesapeake and Ohio Canal National Historical Park.