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1
Lancaster, Pa. : Field Conference of Pennsylvania Geologists, 2010

Conference Proceeding Book
2
by MacLachlan, David B.
Harrisburg, Pa., Bureau of Topographic and Geologic Survey, Dept. of Internal Affairs, 1966

Conference Proceeding Book
3
Washington, D.C. : American Geophysical Union, 1989

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Conference Proceeding Book
4
by Lienkaemper, James J.
[Menlo Park, CA] : U.S. Geological Survey, 1989

Government Document Book
6
Washington, D.C. : American Geophysical Union, 1989

Conference Proceeding Book
7
Washington, D.C. : American Geophysical Union, 1989

Conference Proceeding Book
9
Washington, D.C. : American Geophysical Union, 1989

Conference Proceeding Book
10
Washington, D.C. : American Geophysical Union, 1989

Conference Proceeding Book
11
Washington, D.C. : American Geophysical Union, 1989

Conference Proceeding Book
12
14
[Midland, Tex.] : The Society, 1983

Book
15
Washington, D.C. : American Geophysical Union, 1989

Conference Proceeding Book
18
Washington, D.C. : American Geophysical Union, 1989

Conference Proceeding Book
20
Washington, D.C. : American Geophysical Union, 1989

Conference Proceeding Book