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1
Geology of Tioga and Bradford Counties, Pennsylvania.
Harrisburg : Bureau of Topographic and Geologic Survey, 1981

Conference Proceeding Book
2
Guidebook for the 46th Annual Field Conference of Pennsylvania Geologists : geology of Tioga and Bedford Counties, Pennsylvania /
Harrisburg, PA : Distributed by Field Conference of Pennsylvania Geologists c/o Dept. of Environmental Resources, Bureau of Topographic and Geologic Survey, 1981

Government Document Conference Proceeding Book
3
46th Annual Field Conference of Pennsylvania Geologists.
Harrisburg : Bureau of Topographic and Geologic Survey, 1981

Conference Proceeding Book
4
Guidebook for the 46th Annual Field Conference of Pennsylvania Geologists : geology of Tioga and Bedford Counties, Pennsylvania
Harrisburg, PA : distributed by Field Conference of Pennsylvania Geologists, Inc. c/o Dept. of Environmental Resources, Bureau of Topographic and Geologic Survey, 1981

Conference Proceeding Book
5
Geology of Tioga and Bradford Counties, Pennsylvania. /
Harrisburg : Bureau of Topographic and Geologic Survey, 1981

Conference Proceeding Book
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