00514nam a22001817a 4500 12016 12016 211113b ||||| |||| 00| 0 eng d 9780707747019 623.8932 UKH UK Hydrographic Office Admiralty list of radio signals : Vol.1-Part-1 2020 United Kingdom UK Hydrographic Office 2020 xviii, 324p. Radio in navigation Aids to navigation Cipher and telegraph codes BK 0 0 ddc 0 623_893200000000000_UKH 0 NFIC 14546 MU MU GEN 2021-11-13 623.8932 UKH MPC6447 2021-11-13 BK Column-1