Lower Cretaceous

Chicago citation style
Maryland Geological Survey. Lower Cretaceous. 1911. Retrieved from the Digital Public Library of America, http://catalog.hathitrust.org/Record/001663879. (Accessed November 20, 2018.)
APA citation style
Maryland Geological Survey, (1911) Lower Cretaceous. Retrieved from the Digital Public Library of America, http://catalog.hathitrust.org/Record/001663879
MLA citation style
Maryland Geological Survey. Retrieved from the Digital Public Library of America <http://catalog.hathitrust.org/Record/001663879>.
Note: These citations are programmatically generated and may be incomplete.