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1
Earthquake catalog and epicenter map of Pennsylvania
by Faill, Rodger T.
Middletown, PA : Pennsylvania Geological Survey, 2004

Government Document Electronic Book
2
Bedrock geology of the Coatesville quadrangle, Chester County, Pennsylvania
by Blackmer, Gale C. (Gale Corless)
Middletown, PA : Pennsylvania Geological Survey, 2004

Government Document Electronic Book
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