The Admiralty list of wireless signals.
Great Britain.Hydrographic Department.
London : His Majesty's Stationery Office,
Description based on: 1922.
"Corrected to the 31st December ... ."
Hydrographic Department, Admiralty.
"Including details of direction finding, weather bulletins, storm and navigational warnings, and time signal stations (varies)."
Two volumes yearly.
Volume designation begins with issue for 1931.
Includes supplements.
Cipher and telegraph codes
Admiralty list of radio signals