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1
Stratigraphy of the Devonian Trimmers Rock in eastern Pennsylvania /
by Frakes, Lawrence A.
Harrisburg, Pa. : Commonwealth of Pennsylvania [Department of Internal Affairs, Bureau of Topographic and Geological Survey], 1967

Thesis Book
2
The Pennsylvanian Mill Creek limestone in Pennsylvania /
by Chow, Minchen Ming
[Harrisburg, Pa.] : Pennsylvania. Bureau of Topographic and Geologic Survey, 1951

Government Document Thesis Book
3
Structure of the Jacksonburg formation in Northampton and Lehigh Counties, Pennsylvania /
by Sherwood, W. Cullen (William Cullen)
Harrisburg, PA. : Commonwealth of Pennsylvania [Department of Internal Affairs, Bureau of Topographic and Geological Survey], 1964

Thesis Book
4
Structure of the Jacksonburg formation in Northampton and Lehigh Counties, Pennsylvania /
by Sherwood, W. Cullen (William Cullen)
Harrisburg, PA. : Pennsylvania, Bureau of Topographic and Geological Survey, 1964

Government Document Thesis Book
5
Pleistocene terraces of the Susquehanna River, Pennsylvania /
by Peltier, Louis C.
Harrisburg, Pa. : Pennsylvania Bureau of Topographic and Geologic Survey, 1949

Government Document Thesis Book
6
Stratigraphy of the Devonian Trimmers Rock in Eastern Pennsylvania /
by Frakes, Lawrence A.
Harrisburg, Pa. : Pennsylvania, Bureau of Topographic and Geological Survey, 1967

Government Document Thesis Book
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