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Media type:
Book
Title:
History of telegraphy
Contains:
Pt. 1. Terrestrial telegraphy: Things mechanical ; Early electric ideas ; Commercial telegraphy ; Military operations ; Submarine cables -- pt. 2. Aerial telegraphy: Marconia and the experimenters ; Telegraphy for peace-- ; -- and at war ; Military telegraphy at sea ; Military telegraphy in the air ; Epilogue.