Note 2 — CHAPTER 1 Introduction
Reading edition
Telegraphy, A Detailed Exposition of the Telegraph System of the British Post Office, by T. E. Herbert, Fourth Edition (with Addendum), Sir Isaac Pitman & Sons, Ltd., London, 1920.
Reading edition
Telegraphy, A Detailed Exposition of the Telegraph System of the British Post Office, by T. E. Herbert, Fourth Edition (with Addendum), Sir Isaac Pitman & Sons, Ltd., London, 1920.