Cyclopedia of telephony and telegraphy: a general reference work ... - American School of Correspondence, Chicago. (The School, 1912)
"Authorities consulted" at beginning of each volume.
v. 1. Principles; sub-stations; party-line; systems; protection.- v. 2. Manual switchboards; automatic systems; power plants.- v. 3. Construction; engineering; maintenance; measurements; batteries.- v. 4. Telegraphy, wireless; transmission; electricity; index.
Keywords: Telegraph.; Telephone.