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1
Harrisburg, Pa. : The Department of Environmental Resources, Office of Resources Management, 1970
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2
by Jennings, O. E. (Otto Emery), 1877-1964
[Pittsburgh, Pa. : Botanical Society of Western Pennsylvania], 1939
[Pittsburgh, Pa. : Botanical Society of Western Pennsylvania], 1939
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3
by Jennings, O. E. (Otto Emery), 1877-1964
[Philadephis, Pa.] : Proceedings of the Pennsylvania Academy of Science, 1927
[Philadephis, Pa.] : Proceedings of the Pennsylvania Academy of Science, 1927
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Book Chapter
4
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5
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