Radio & cable map of the world /
Great Britain.War Office.Geographical Section.General Staff.
London : War Office,
1927.
Previous editions issued under title "Cable map of the world".
Shows British, foreign and ex-German cable and radio lines.
Legend shows list of 29 private cable companies.
Includes 8 detail inset maps.
Telegraph
Telephone lines
Cables, Submarine
Radiotelephone
Radio
Communication and traffic
World maps.