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2
The vascular flora of Northampton County, Pennsylvania.
by Schaeffer, Robert L., 1917-
Philadelphia [publisher not identified] 1949

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
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