Original U.S. Army Signal Corps "Field Telephones" Electrical Engineering Pamphlet No. 3 dated October 24, 1918. Covers field telephones type EE-3, EE-4, EE-5 and is 20 pages. Discusses use of field telephones in trench warfare, etc. Good to very good condition with callsign 8EU stamped on front cover - see photos. Pamphlet size is 4.5" x 7.0".