UK Hydrographic Office
Admiralty list of radio signals : Vol.1-Part-1 - 2020 - United Kingdom UK Hydrographic Office 2020 - xviii, 324p.
9780707747019
Radio in navigation
Aids to navigation
Cipher and telegraph codes
623.8932 / UKH
Admiralty list of radio signals : Vol.1-Part-1 - 2020 - United Kingdom UK Hydrographic Office 2020 - xviii, 324p.
9780707747019
Radio in navigation
Aids to navigation
Cipher and telegraph codes
623.8932 / UKH