Basaltic rock formation, probably in Olympic National Park, date unknown

Chicago citation style
Unknown. Basaltic rock formation, probably in Olympic National Park, date unknown. Retrieved from the Digital Public Library of America, http://cdm16786.contentdm.oclc.org/cdm/ref/collection/nps/id/1867. (Accessed October 15, 2018.)
APA citation style
Unknown, Basaltic rock formation, probably in Olympic National Park, date unknown. Retrieved from the Digital Public Library of America, http://cdm16786.contentdm.oclc.org/cdm/ref/collection/nps/id/1867
MLA citation style
Unknown. Retrieved from the Digital Public Library of America <http://cdm16786.contentdm.oclc.org/cdm/ref/collection/nps/id/1867>.
Note: These citations are programmatically generated and may be incomplete.