Sand pattern with tree branch, possibly in Olympic National Park, date unknown

Chicago citation style
Unknown. Sand pattern with tree branch, possibly in Olympic National Park, date unknown. Retrieved from the Digital Public Library of America, http://cdm16786.contentdm.oclc.org/cdm/ref/collection/nps/id/1691. (Accessed June 19, 2018.)
APA citation style
Unknown, Sand pattern with tree branch, possibly in Olympic National Park, date unknown. Retrieved from the Digital Public Library of America, http://cdm16786.contentdm.oclc.org/cdm/ref/collection/nps/id/1691
MLA citation style
Unknown. Retrieved from the Digital Public Library of America <http://cdm16786.contentdm.oclc.org/cdm/ref/collection/nps/id/1691>.
Note: These citations are programmatically generated and may be incomplete.