Pontoon bridge across river at Richmond, Va

Chicago citation style
War Department. Office of the Chief Signal Officer. (8/1/1866 - 9/18/1947). Pontoon bridge across river at Richmond, Va. 1860-01-01/1865-12-31. Retrieved from the Digital Public Library of America, http://catalog.archives.gov/id/529666. (Accessed November 21, 2018.)
APA citation style
War Department. Office of the Chief Signal Officer. (8/1/1866 - 9/18/1947), (1860-01-01/1865-12-31) Pontoon bridge across river at Richmond, Va. Retrieved from the Digital Public Library of America, http://catalog.archives.gov/id/529666
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/529666>.
Note: These citations are programmatically generated and may be incomplete.