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keyword: Telegraph – 5 free books.
These books are included in Project Gutenberg. They are archived and can be improved at GITenberg.
Samuel F. B. Morse, His Letters and Journals In Two Volumes, Volume II
Edward Lind Morse (editor) and Samuel Finley Breese Morse (Author)
Samuel F. B. Morse, His Letters and Journals In Two Volumes, Volume I.
Edward Lind Morse (editor) and Samuel Finley Breese Morse (Author)
Cyclopedia of Telephony and Telegraphy, Vol. 1 A General Reference Work on Telephony, etc. etc.
American School of Correspondence
Cyclopedia of Telephony and Telegraphy, Vol. 2 A General Reference Work on Telephony, etc. etc.
American School of Correspondence