"Conveyor suspension bridge under construction."

Chicago citation style
Department of the Interior. Bureau of Reclamation. Engineering and Research Center. 5/18/1981-3/4/1988. "Conveyor suspension bridge under construction.". 1935-09. Retrieved from the Digital Public Library of America, http://catalog.archives.gov/id/294017. (Accessed June 19, 2018.)
APA citation style
Department of the Interior. Bureau of Reclamation. Engineering and Research Center. 5/18/1981-3/4/1988, (1935-09) "Conveyor suspension bridge under construction.". Retrieved from the Digital Public Library of America, http://catalog.archives.gov/id/294017
MLA citation style
Department of the Interior. Bureau of Reclamation. Engineering and Research Center. 5/18/1981-3/4/1988. Retrieved from the Digital Public Library of America <http://catalog.archives.gov/id/294017>.
Note: These citations are programmatically generated and may be incomplete.