TY  - BOOK
AU  - Reed,John Calvin
AU  - Sigafoos,Robert Sumner
AU  - Fisher,George Wescott
ED  - Geological Survey (U.S.).
TI  - The river and the rocks: the geologic story of Great Falls and Potomac River Gorge 
U1  - 557.52 
PY  - 1980///
CY  - Washington, D.C
PB  - United States Government Printing Office
KW  - Geology
KW  - Great Falls of the Potomac (Md. and Va.)
KW  - Guidebooks
KW  - Natural history
KW  - Potomac (Md. and Va.)
KW  - Survey
N1  - Edition of 1970 by United States Geological Survey and National Park Service; Bibliography: p. 74
ER  -