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1966
Folded Structure. Harrisburg …
Scovel, James L. ; O'Brien, …
0889.020
1966
Folds. Loysvill, PA. Folded …
Scovel, James L. ; O'Brien, …
0889.021
1872
Penn. geological formations.
Lesley, J. P. (J. Peter), 18 …
1155.001
1858
Geological Map Of The State …
Rogers, Henry Darwin
4120.000
1850
Bradys Bend, Armstrong Count …
Franks, Theo.; Brady's Bend …
5002.000
1960
Pennsylvania -- Geology
Topographic and Geologic Sur …
7148.000