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1
Geology and mineral resources of northeastern Franklin County, Pennsylvania,
by Root, Samuel I.
Harrisburg [Commonwealth of Pennsylvania, Dept. of Environmental Resources, Bureau of Topographic and Geologic Survey] 1971

Unknown
2
Atlas of breeding birds in Pennsylvania /
Pittsburgh, Pa. : University of Pittsburgh Press, 1992

Book
3
Edible wild plants of Pennsylvania and neighboring states /
by Medve, Richard J.
University Park [Pa.] : Pennsylvania State University Press, 1990

Book
4
Common wild flowers of Pennsylvania /
by Gress, Ernest Milton, 1876-1968
Altoona, Pa. : Printed and distributed by the Times Tribune Company, 1928

Book
5
Trees of Pennsylvania : the Atlantic States and the Lake States.
by Li, Hui-Lin, 1911-
Philadelphia, Pa. : University of Pennsylvania Press 1972

Book
6
Ceratiocaridae from the upper Devonian measures in Warren County,
by Beecher, Charles Emerson, 1856-1904
Harrisburg, Pub. by the Board of Commissioners for the Second Geological Survey, 1884

Book
7
Engineering characteristics of the rocks of Pennsylvania; environmental geology supplement to the State geologic map /
by McGlade, William G.
Harrisburg : [Commonwealth of Pennsylvania, Bureau of Topographic & Geologic Survey], 1972

Book
8
A glorious enterprise : the Academy of Natural Sciences of Philadelphia and the making of American science /
by Peck, Robert McCracken, 1952-
Philadelphia : University of Pennsylvania Press, 2012
1st ed.

Book
9
Geology and mineral resources of northeastern Franklin County, Pennsylvania /
by Root, Samuel I.
Harrisburg : [Commonwealth of Pennsylvania, Dept. of Environmental Resources, Bureau of Topographic and Geologic Survey], 1971

Book
10
Quality of gravel resources in northwestern Pennsylvania /
by Craft, Jesse L.
Harrisburg : Commonwealth of Pennsylvania, Dept. of Environmental Resources, Bureau of Topographic and Geologic Survey ; additional copies may be purchased from State Book Store, 1979

Book
11
Historic Germantown, from the founding to the early part of the nineteenth century; a survey of the German township
by Tinkcom, Harry Marlin
Philadelphia, American Philosophical Society, 1955

Book
12
Two hundred tables of elevation above tide-level of the railroad stations, summits and tunnels; canal locks and dams, river rifles &c., in and around Pennsylvania /
by Allen, Charles
Harrisburg : Pub. by the Board of Commissioners for the Second geological survey, 1878

Book
13
Common trees of Pennsylvania, how to know them, where to see them,
by Illick, Joseph Simon, 1884-
Altoona, Pa., The Times Tribune Company, 1926
2d ed, rev, and enl.

Book
14
The mineralogy of Pennsylvania, 1966-1975 /
by Smith, Robert Charles, 1945-
[Philadelphia] : Friends of Mineralogy, Pennsylvania Chapter, 1978

Book
15
Final report ordered by Legislature, 1891. A general index of the Final summary report of the geology of Pennsylvania.
Harrisburg, Pub. by the Board of Commissioners for the Second Geological Survey, 1895

Book
16
Report on the coal mines of the Monongahela River region from the West Virginia state line to Pittsburgh : including the mines on the lower Youghiogheny river /
by Wall, J. Sutton
Harrisburg : Pub. by the Board of Commissioners for the Second Geological Survey, 1884

Book
17
Source-rock heavy minerals of the Pennsylvania area /
by Dryden, Lincoln, 1903-
[Bryn Mawr, Pa.] : Bryn Mawr College, 1964

Book
19
Outstanding scenic geological features of Pennsylvania /
by Geyer, Alan R., Bolles, William H.
Harrisburg, Pa. : Commonwealth of Pennsylvania, Dept. of Environmental Resources, Bureau of Topographic and Geologic Survey : may be purchased from State Book Store 1979

Book
20
Typhoid and the politics of public health in nineteenth-century Philadelphia /
by McCarthy, Michael P.
Philadelphia : American Philosophical Society, 1987

Book
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