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 [microform].
United States. Army. Signal Corps.
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 [microform].