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Indian Echo Cave south of Hummelstown

MLA citation style
Bolles, W. H. “Indian Echo Cave South Of Hummelstown”. no date. 8101, 1971.
APA citation style
Bolles, W. H. (1971). Indian Echo Cave south of Hummelstown. 8101. Retrieved from https://digitalarchives.powerlibrary.org/papd/islandora/object/papd%3Aspgsl-photo_3503
Chicago citation style
Bolles, William H. “Indian Echo Cave South Of Hummelstown”. 8101, Pennsylvania Geological Survey - Historical Photographs, 1971. https://digitalarchives.powerlibrary.org/papd/islandora/object/papd%3Aspgsl-photo_3503.
Note: These citations are programmatically generated and may be incomplete.