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Penn's Grandest Cavern
978-0-271-02266-6Henry Shoemaker1920s literature PA history RegionalStudiesMetalmark Penn's GrandestCavern: Cave studiesCentre Country
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Public-domain status shown for GLOBAL. OAPEN open-access record with explicit license: CC-BY-NC-ND
Public-domain status shown for GLOBAL. OAPEN open-access record with explicit license: CC-BY-NC-ND