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81
Harrisburg, PA (c/o Dept. of Environmental Resources, Bureau of Topographic and Geologic Survey, P.O. Box 2357) : Guidebooks distributed by Field Conference of Pennsylvania Geologists, 1988

Conference Proceeding Book
82
Harrisburg : Distributed by Field Conference of Pennsylvania Geologists, Dept. of Environmental Resources, 1976

Conference Proceeding Book
83
[Harrisburg] Pennsylvania Geological Survey, 1963

Conference Proceeding Book
84
[Philadelphia, Pa.? : s.n., 1926

Conference Proceeding Book
85
London : Printed by George E. Eyre and William Spottiswoode ... for Her Majesty's Stationary Office, 1876

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Conference Proceeding Book
86
[Philadelphia, Pa.? : s.n., 1939

This item is not available through EZBorrow. Please contact your institution’s interlibrary loan office for further assistance.
Conference Proceeding Book
87
[Philadelphia, Pa.] : Print. Division, Procurement Dept., city of Philadelphia, 1966

This item is not available through EZBorrow. Please contact your institution’s interlibrary loan office for further assistance.
Conference Proceeding Book
88
[Philadelphia, Pa.? : s.n., 1926

This item is not available through EZBorrow. Please contact your institution’s interlibrary loan office for further assistance.
Conference Proceeding Book
89
Philadelphia : J. B. Lippincott & co., 1876

Conference Proceeding Book
90
by Eggleston, Jane R.
Washington, D.C. : American Geophysical Union, 1989

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Conference Proceeding Book