Geological Formations: Rock Formations

Chicago citation style
Department of Agriculture. Forest Service. 7/1/1905. Geological Formations: Rock Formations. Retrieved from the Digital Public Library of America, http://catalog.archives.gov/id/7051031. (Accessed October 21, 2018.)
APA citation style
Department of Agriculture. Forest Service. 7/1/1905, Geological Formations: Rock Formations. Retrieved from the Digital Public Library of America, http://catalog.archives.gov/id/7051031
MLA citation style
Department of Agriculture. Forest Service. 7/1/1905. Retrieved from the Digital Public Library of America <http://catalog.archives.gov/id/7051031>.
Note: These citations are programmatically generated and may be incomplete.