Witt, Wallace de
Bedrock geology of the evitts creek and Pattersons creek Quadrangles, Maryland, Pennsylvania, and West Virginia / by Wallace de Witt and George W. Colton. -- Washington : United States Government Printing Office, 1964 - 90 p. + map. -- (Geological Survey Bulletin ; 1173).
Geología
Maryland
Pennsylvania
Virginia
55(73)
Bedrock geology of the evitts creek and Pattersons creek Quadrangles, Maryland, Pennsylvania, and West Virginia / by Wallace de Witt and George W. Colton. -- Washington : United States Government Printing Office, 1964 - 90 p. + map. -- (Geological Survey Bulletin ; 1173).
Geología
Maryland
Pennsylvania
Virginia
55(73)