Eocene

Chicago citation style
Maryland Geological Survey. Eocene. 1901. Retrieved from the Digital Public Library of America, http://catalog.hathitrust.org/Record/001663877. (Accessed November 19, 2018.)
APA citation style
Maryland Geological Survey, (1901) Eocene. Retrieved from the Digital Public Library of America, http://catalog.hathitrust.org/Record/001663877
MLA citation style
Maryland Geological Survey. Retrieved from the Digital Public Library of America <http://catalog.hathitrust.org/Record/001663877>.
Note: These citations are programmatically generated and may be incomplete.