Garald G. ParkerA.G. HelyWalter B. KeightonF.H. Olmsted
Ground water its availability and character ContinuedThe Appalachian Highlands Continued page Occurrence of ground water________-_________ 71 Crystalline rocks_______---___^__________ 72 Gneiss and related crystalline rocks of Precambrian age______-_--________ 72 Glenarm series_
David M. WolockGregory J. McCabeGary D. TaskerMarshall E. Moss