Mineral collecting in Pennsylvania / by Alan R. Geyer, Robert C. Smith II [and] John H. Barnes. Graphics by Albert E. VanOlden. 4th ed.

Chicago citation style
Geyer, Alan R. Mineral collecting in Pennsylvania / by Alan R. Geyer, Robert C. Smith II [and] John H. Barnes. Graphics by Albert E. VanOlden. 4th ed.. Retrieved from the Digital Public Library of America, https://archive.org/details/mineralcollectin00geye. (Accessed September 20, 2018.)
APA citation style
Geyer, Alan R, Mineral collecting in Pennsylvania / by Alan R. Geyer, Robert C. Smith II [and] John H. Barnes. Graphics by Albert E. VanOlden. 4th ed.. Retrieved from the Digital Public Library of America, https://archive.org/details/mineralcollectin00geye
MLA citation style
Geyer, Alan R. Retrieved from the Digital Public Library of America <https://archive.org/details/mineralcollectin00geye>.
Note: These citations are programmatically generated and may be incomplete.