Colorado River. Grand Canyon, looking west from foot of Toroweap (FSD has a pencil sketch tieing this photo with no. 896). Old nos. 498, 938, 471.

Chicago citation style
War Department. Office of the Chief of Engineers. Powell Survey. (1869 - ca. 1874). Colorado River. Grand Canyon, looking west from foot of Toroweap (FSD has a pencil sketch tieing this photo with no. 896). Old nos. 498, 938, 471.. 1871-01-01/1878-12-31. Retrieved from the Digital Public Library of America, http://catalog.archives.gov/id/518024. (Accessed December 14, 2018.)
APA citation style
War Department. Office of the Chief of Engineers. Powell Survey. (1869 - ca. 1874), (1871-01-01/1878-12-31) Colorado River. Grand Canyon, looking west from foot of Toroweap (FSD has a pencil sketch tieing this photo with no. 896). Old nos. 498, 938, 471.. Retrieved from the Digital Public Library of America, http://catalog.archives.gov/id/518024
MLA citation style
War Department. Office of the Chief of Engineers. Powell Survey. (1869 - ca. 1874). Retrieved from the Digital Public Library of America <http://catalog.archives.gov/id/518024>.
Note: These citations are programmatically generated and may be incomplete.