|Authors :||Pennsylvania, Bureau of Topographic and Geologic Survey., Geological Survey (U.S.)|
|Title:||Topographic and geologic atlas of Pennsylvania|
Topographic and geologic atlas of Pennsylvania
Pennsylvania, Bureau of Topographic and Geologic Survey.Geological Survey (U.S.)
Harrisburg, Pa: The Survey,
|Publication Info:||Pittsburgh: University of Pittsburgh, Digital Research Library
This work is believed to be in the public domain with no known restrictions on access and use.
Mines and mineral resources--Pennsylvania.