Penstock tunnels under construction at the Gorge Dam Powerhouse site, April 1922

Chicago citation style
Penstock tunnels under construction at the Gorge Dam Powerhouse site, April 1922. 1922. Retrieved from the Digital Public Library of America, http://cdm16786.contentdm.oclc.org/cdm/ref/collection/ww-swps/id/163. (Accessed October 18, 2018.)
APA citation style
(1922) Penstock tunnels under construction at the Gorge Dam Powerhouse site, April 1922. Retrieved from the Digital Public Library of America, http://cdm16786.contentdm.oclc.org/cdm/ref/collection/ww-swps/id/163
MLA citation style
Retrieved from the Digital Public Library of America <http://cdm16786.contentdm.oclc.org/cdm/ref/collection/ww-swps/id/163>.
Note: These citations are programmatically generated and may be incomplete.