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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
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Conference Proceeding
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85
London : Printed by George E. Eyre and William Spottiswoode ... for Her Majesty's Stationary Office, 1876
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86
[Philadelphia, Pa.? : s.n., 1939
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Conference Proceeding
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87
[Philadelphia, Pa.] : Print. Division, Procurement Dept., city of Philadelphia, 1966
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Conference Proceeding
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88
[Philadelphia, Pa.? : s.n., 1926
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89
90
Anthracite basins of eastern Pennsylvania : Pottsville to Shamokin, Pennsylvania, July 13-16, 1989 /
by Eggleston, Jane R.
Washington, D.C. : American Geophysical Union, 1989
Washington, D.C. : American Geophysical Union, 1989
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Conference Proceeding
Book