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1
Harrisburg, PA : distributed by Field Conference of Pennsylvania Geologists, Inc. c/o Dept. of Environmental Resources, Bureau of Topographic and Geologic Survey, 1987

Conference Proceeding Book
2
Washington, D.C. : American Geophysical Union, 1989

Conference Proceeding Book
3
Harrisburg, PA : Bureau of Topographic and Geologic Survey, 1987

Conference Proceeding Book
4
Harrisburg, PA : Bureau of Topographic and Geologic Survey, 1987

Conference Proceeding Book