TY - BOOK AU - Southworth,Scott TI - Geology of the Chesapeake and Ohio Canal National Historical Park and Potomac River corridor, District of Columbia, Maryland, West Virginia, and Virginia T2 - U.S. Geological Survey professional paper PY - 2008///] CY - Reston, Va. PB - U.S. Geological Survey KW - Geology, Stratigraphic KW - Mesozoic KW - Quaternary KW - Geology KW - Chesapeake and Ohio Canal National Historical Park KW - Potomac River Valley N1 - One color folded map in pocket; Includes bibliogr. references : (p. 93-97) ER -