mapped, edited, and published by the Geological Survey ; state of Maryland, Maryland Geological Survey ; commonwealth of Pennsylvania, Department of Environmental Resources, Topographic and Geologic Survey
Commonwealth of Pennsylvania Deptartment of Environmental Resources, Topographic and Geologic Survey ; Arthur A. Socolow ; compiled and edited by Carlyle Gray ... [et al.]
Date
1960
Series
Map (Pennsylvania. Bureau of Topographic and Geologic Survey) ; 1