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1
Guidebook, 24th Annual Field Conference of Pennsylvania Geologists /
[Harrisburg] : Pennsylvania Geological Survey, 1959

Conference Proceeding Book
2
The geology of Erie and Crawford Counties /
by White, I. C. (Israel Charles), 1848-1927
Harrisburg, [Pa.] : Pub. by the Board of Commissioners for the Second Geological Survey, 1881

Government Document Book
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