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1
by Edmunds, William E.
Harrisburg : Commonwealth of Pennsylvania, Dept. of Conservation and Natural Resources, Office of Conservation and Engineering Services, Bureau of Topographic and Geologic Survey, 2004
2nd ed.
Harrisburg : Commonwealth of Pennsylvania, Dept. of Conservation and Natural Resources, Office of Conservation and Engineering Services, Bureau of Topographic and Geologic Survey, 2004
2nd ed.
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2
by Wetmore, Alexander, b. 1886
Washington, Smithsonian Institution, 1965
Washington, Smithsonian Institution, 1965
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3
by Ohwi, Jisaburo
Washington : Smithsonian Institute, 1965
Washington : Smithsonian Institute, 1965
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5
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by Fosnot, Catherine Twomey
Portsmouth, NH : Heinemann, 2001
Portsmouth, NH : Heinemann, 2001
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9
10
Harrisburg, Pa. : Pennsylvania Game Commission, 1991
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12
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by Hilger, M. Inez (Mary Inez), 1891-1977
Washington, Smithsonian Institution, 1957
Washington, Smithsonian Institution, 1957
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15
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17
by Platt, Franklin, 1844-1900
Harrisburg [Pa.] : Published by the Board of Commissioners for the Second Geological Survey, 1876
Harrisburg [Pa.] : Published by the Board of Commissioners for the Second Geological Survey, 1876
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18
by Paradis, James G., 1942-
Lincoln : University of Nebraska Press, 1978
Lincoln : University of Nebraska Press, 1978
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19