01662oam 2200457 450 991070784650332120161219153954.0(CKB)5470000002468094(OCoLC)885281961(EXLCZ)99547000000246809420140805d1980 ua 0engurbn|||||||||txtrdacontentcrdamediacrrdacarrierThe river and the rocks the geologic story of Great Falls and the Potomac River Gorge /by John C. Reed, Jr., Robert S. Sigafoos, and George W. Fisher[Reston, Va.] :United States Department of the Interior, Geological Survey,1980.Washington :United States Government Printing Office.1 online resource (vii, 75 pages) illustrationsGeological Survey bulletin ;1471Includes bibliographical references (page 74).River and the rocks GeologyGreat Falls of the Potomac (Md. and Va.)GuidebooksNatural historyGreat Falls of the Potomac (Md. and Va.)GuidebooksGreat Falls of the Potomac (Md. and Va.)GuidebooksGeologyNatural historyReed John CalvinJr.,1930-1384915Fisher George Wescott1937-Sigafoos Robert Sumner1920-Geological Survey (U.S.),COPCOPOCLCOOCLCAGPOBOOK9910707846503321The river and the rocks3486328UNINA