http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Instructions for using heliograph of Signal Corps, U.S. Army, authorized by G.O. No. 99, 1888, amended by G.O. No. 59, 1889, and G.O. No. 32, 1896, Headquarters of Army, Adjutant-General's Office
Electronic reproduction. [Bethesda, Md.] : ProQuest, 2014. digital, PDF file. ProQuest U.S. Executive Branch Documents Mode of access: World Wide Web via ProQuest website.