"Completed concrete tunnel lining near inlet portal of diversion tunnel No. 4. Coating of moisture reserving paint is seen at top. The bands of rough-surfaced concrete seen mark the position of the gores inserted between the elements of the form to effect the construction of curves in the tunnel alignment."

Chicago citation style
Department of the Interior. Bureau of Reclamation. Engineering and Research Center. 5/18/1981-3/4/1988. "Completed concrete tunnel lining near inlet portal of diversion tunnel No. 4. Coating of moisture reserving paint is seen at top. The bands of rough-surfaced concrete seen mark the position of the gores inserted between the elements of the form to effect the construction of curves in the tunnel alignment.". 1932-07-01. Retrieved from the Digital Public Library of America, http://catalog.archives.gov/id/293692. (Accessed September 18, 2018.)
APA citation style
Department of the Interior. Bureau of Reclamation. Engineering and Research Center. 5/18/1981-3/4/1988, (1932-07-01) "Completed concrete tunnel lining near inlet portal of diversion tunnel No. 4. Coating of moisture reserving paint is seen at top. The bands of rough-surfaced concrete seen mark the position of the gores inserted between the elements of the form to effect the construction of curves in the tunnel alignment.". Retrieved from the Digital Public Library of America, http://catalog.archives.gov/id/293692
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/293692>.
Note: These citations are programmatically generated and may be incomplete.