Telegraphy
Telegraphy - History, Science, and Engineering through Historical Reproduction
Early History of the Electro-Magnetic Telegraph
from the Letters and Journals of Alfred Vail
Edison, Quadraplex Telegraphy (Audio Book)
Channel Capacity (toward contemporary communication)
Thomas Edison was America's most famous telegrapher
Edison, Boyhood in Port Huron, Michigan (Audio Book)
Boy's Life Magazine - Morse Code Machine
Everything is New at Some Point... How to Dial a Telephone, 1927
(what relays are needed to make the analog telephone work?)