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1
by Johnson, Meredith E.
Harrisburg : Commonwealth of Pennsylvania, Bureau of Topographic and Geologic Survey, 1925

Book
2
Newark, Del. : University of Delaware, 2001

Book
3
Harrisburg : Pennsylvania Dept. of Internal Affairs, Bureau of Topographic and Geologic Survey, 1946

Government Document Book
4
by Leverett, Frank, 1859-1943
Harrisburg, Pa. : Department of internal affairs, Topographic and geologic survey, 1934

Book
5
by Wakeley, James S., 1950-
Harrisburg, Pa. : Pennsylvania Game Commission, 1985
2nd ed.

Book
8
by Kent, Bion H. (Bion Huntley), 1925-
Harrisburg : Pennsylvania Geological Survey : may be purchased from State Book Store, 1974

Book
9
by Wagner, Walter Richard, 1928-1974
Harrisburg : Pennsylvania Geological Survey, 1976

Book
10
by Geyer, Alan R.
Harrisburg [Pa.] : Pennsylvania, Bureau of Topographic and Geologic Survey, 1987

Government Document Book
11
by Lohman, S. W. (Stanley William), 1907-1992
Harrisburg : Pa. Dept. of Internal Affairs, Topographic and Geologic Survey, 1937

Government Document Book
12
Harrisburg, Board of Commissioners for the Geological Survey, 1892

Government Document Book
13
by Glass, Gary B.
Harrisburg [Commonwealth of Pennsylvania, Dept. of Environmental Resources, Bureau of Topographic and Geologic Survey] 1974

Book
14
by Wrigley, Henry E.
Harrisburg, Pub. by the Board of commissioners for the Second geological survey, 1875

Book
15
by Stone, Ralph W. (Ralph Walter), 1876-1964
Harrisburg, Dept. of internal affairs, Topographic and geologic survey, 1932

Book
16
by Frazer, Persifor, 1844-1909
Harrisburg : Pub. by the Board of commissioners for the Second geological survey, 1880

Book
17
by Leighton, Henry, 1884-
Pittsburgh, Pa., Carnegie museum, Jones' bookshop 1927
Special ed.

Book
19
by Butts, Charles, 1863-1946, Moore, Elwood S., 1878-
[Washington, D.C.] : United States Department of the Interior, Geological Survey, 1936

Government Document eBook
20

Journal