Ocean flotsam on rocks, probably in Olympic National Park, date unknown

Chicago citation style
Unknown. Ocean flotsam on rocks, 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/1395. (Accessed July 20, 2018.)
APA citation style
Unknown, Ocean flotsam on rocks, 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/1395
MLA citation style
Unknown. Retrieved from the Digital Public Library of America <http://cdm16786.contentdm.oclc.org/cdm/ref/collection/nps/id/1395>.
Note: These citations are programmatically generated and may be incomplete.