Bold Bluffs (basaltic formation) along the Columbia River

Chicago citation style
Not Known. Bold Bluffs (basaltic formation) along the Columbia River. [Date not indicated]. Retrieved from the Digital Public Library of America, http://ark.cdlib.org/ark:/13030/kt429014nx. (Accessed December 14, 2018.)
APA citation style
Not Known, ([Date not indicated]) Bold Bluffs (basaltic formation) along the Columbia River. Retrieved from the Digital Public Library of America, http://ark.cdlib.org/ark:/13030/kt429014nx
MLA citation style
Not Known. Retrieved from the Digital Public Library of America <http://ark.cdlib.org/ark:/13030/kt429014nx>.
Note: These citations are programmatically generated and may be incomplete.