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1
Town geology : the lesson of the Philadelphia rocks : studies of nature along the highways and among the byways of a metropolitan town /
by Heilprin, Angelo, 1853-1907
Philadelphia : Published by the author. Academy of Natural Sciences, 1885

Book
2
Petrology and geochemistry of a diabase contact suite, Cornwall, Pennsylvania /

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Thesis Book
3
Hollidaysburg--Huntingdon folio, Pennsylvania /
by Butts, Charles, 1863-1946
Washington, D.C. : U.S. Geological Survey, 1945

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Book
4
U.S. Geological Survey programs in Pennsylvania.
[Reston, Va.?] : U.S. Dept. of the Interior, U.S. Geological Survey, 1996

Government Document Book
5
Proposed Pennsylvania drought contingency plan for Delaware River Basin : December 1983 /
[Harrisburg, Pennsylvania?] : Delaware River Basin Commission : Pennsylvania Emergency Management Agency, 1983

Book
6
Progress report.

Serial
7
The ornithology of Chester County, Pennsylvania,
by Burns, Frank L. (Franklin Lorenzo), 1869-1946
Boston, R. G. Badger, 1919

Book
8
John Heinz National Wildlife Refuge at Tinicum.
[Washington, D.C.] : U.S. Fish and Wildlife Service, 2003

Government Document Book
9
The 1972 autumn hawk count at Tott's Gap, Pennsylvania /
by Heintzelman, Donald S.
Trenton : New Jersey State Museum, 1973

Book
10
No. 1. The notable trees of Delaware County, Pennsylvania. No. 2. Ecology of the bogs of the New Jersey Pine Barrens. No. 3. The 'scarabs' of the hunt /
by Robinson, Mark (Mark A.)
Media, Pa. : Delaware County Institute of Science, 1965

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Book
11
List of U.S. Geological Survey geologic and water-supply reports and maps for Pennsylvania and New Jersey.
Reston, Va.? : U.S. Dept. of the Interior, 1988

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Book
13
The minimum age of the Woodfordian deglaciation of northeastern Pennsylvania and northwestern New Jersey /

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Thesis Book
15
Topographic and geologic atlas of Pennsylvania.

Serial
16
Northeastern Pennsylvania : toward the year 2000
[Avoca, Pa.] : Economic Development Council of Northeastern Pennsylvania, 1975

Book
17
Landslides in Pennsylvania /
by Delano, Helen L.
Harrisburg, Pa. : Pennsylvania Geological Survey, 2001
Second edition.

Government Document Book
18
Annual report of the Geological Survey of Pennsylvania.
Harrisburg, Pub. by the Board of Commissioners for the Geological Survey, 1886

Serial
19
"Spirifer disjunctus": its evolution and paleoecology in the Catskill delta.
by Greiner, Hugo
New Haven, 1957

Thesis Book
20
An inaugural essay on the effects produced by air upon living animals : Submitted to the examination of the Revd. John Andrews, D.D. Provost, (Pro tempore) the trustees, and medical faculty, of the University of Pennsylvania, for the degree of Doctor of Medicine, on the 5th day of June 1805 /
by Hartshorne, Joseph, 1779-1850
Philadelphia : Printed by James Humphreys for the author, 1805

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Thesis Book
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