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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
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
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