Publications on the geology of Pennsylvania / issued by Pennsylvania Department of Internal Affairs, Bureau of Topographic and Geologic Survey and also United States Geological Survey, United States Bureau of Mines

Chicago citation style
Publications on the geology of Pennsylvania / issued by Pennsylvania Department of Internal Affairs, Bureau of Topographic and Geologic Survey and also United States Geological Survey, United States Bureau of Mines. Retrieved from the Digital Public Library of America, https://archive.org/details/publicationsonge00unse_12. (Accessed December 15, 2018.)
APA citation style
Publications on the geology of Pennsylvania / issued by Pennsylvania Department of Internal Affairs, Bureau of Topographic and Geologic Survey and also United States Geological Survey, United States Bureau of Mines. Retrieved from the Digital Public Library of America, https://archive.org/details/publicationsonge00unse_12
MLA citation style
Retrieved from the Digital Public Library of America <https://archive.org/details/publicationsonge00unse_12>.
Note: These citations are programmatically generated and may be incomplete.