Geological survey of Pennsylvania. Final report ordered by Legislature, 1891. A summary description of the geology of Pennsylvania

Chicago citation style
Pennsylvania. State Geologist (1874-1890). Geological survey of Pennsylvania. Final report ordered by Legislature, 1891. A summary description of the geology of Pennsylvania. Retrieved from the Digital Public Library of America, https://archive.org/details/geologicalsurvey00penn_2. (Accessed December 19, 2018.)
APA citation style
Pennsylvania. State Geologist (1874-1890), Geological survey of Pennsylvania. Final report ordered by Legislature, 1891. A summary description of the geology of Pennsylvania. Retrieved from the Digital Public Library of America, https://archive.org/details/geologicalsurvey00penn_2
MLA citation style
Pennsylvania. State Geologist (1874-1890). Retrieved from the Digital Public Library of America <https://archive.org/details/geologicalsurvey00penn_2>.
Note: These citations are programmatically generated and may be incomplete.