Bridge across the Tennessee River, built by troops Oct. 1863.

Chicago citation style
War Department. Office of the Chief Signal Officer. (8/1/1866 - 9/18/1947). Bridge across the Tennessee River, built by troops Oct. 1863.. 1860-01-01/1865-12-31. Retrieved from the Digital Public Library of America, http://catalog.archives.gov/id/525016. (Accessed September 25, 2018.)
APA citation style
War Department. Office of the Chief Signal Officer. (8/1/1866 - 9/18/1947), (1860-01-01/1865-12-31) Bridge across the Tennessee River, built by troops Oct. 1863.. Retrieved from the Digital Public Library of America, http://catalog.archives.gov/id/525016
MLA citation style
War Department. Office of the Chief Signal Officer. (8/1/1866 - 9/18/1947). Retrieved from the Digital Public Library of America <http://catalog.archives.gov/id/525016>.
Note: These citations are programmatically generated and may be incomplete.