Lava mold of tree, probably Oregon, n.d

Chicago citation style
Lava mold of tree, probably Oregon, n.d. 1912. Retrieved from the Digital Public Library of America, http://cdm16786.contentdm.oclc.org/cdm/ref/collection/ll/id/1254. (Accessed June 24, 2018.)
APA citation style
(1912) Lava mold of tree, probably Oregon, n.d. Retrieved from the Digital Public Library of America, http://cdm16786.contentdm.oclc.org/cdm/ref/collection/ll/id/1254
MLA citation style
Retrieved from the Digital Public Library of America <http://cdm16786.contentdm.oclc.org/cdm/ref/collection/ll/id/1254>.
Note: These citations are programmatically generated and may be incomplete.