Organization of the telephone listening-in service
By: translated at the Army War College from a French document, July, 1917
Series: War Dept. Document -- no. 640; Document (United States. War Department) -- no. 640
Publisher: Govt. Print. Office
Published: 1917
Place of publication: Washington
Language: eng
Number of pages: 10
Subjects: Communication systems; World War, 1914-1918; Communications; Military Communications; Military telephone; United States. Army; United States
Notes: Cover title.

"Confidential! For official use only. Not to be taken into front-line trenches"--P. [1] of cover.

"Translation of an official French document of January, 1917."--p. 5.