00552nam a22001577a 4500008004500000020001800045082001600063100002700079245013200106250001200238260003800250300001000288650002700298650003900325650003000364240702b     2023      ||||| |||| 00| 0 eng d  a9780707747484  a623.8 bUKH  aUK Hydrographic Office  aAdmiralty list of radio signals : maritime radio stations ( Europe, Africa and Asia - excluding the far east) :NP281(1), Vol. 1  a4th ed.  aUKb UK Hydrographic Officec2023  a370p.  aMaritime Radio Station  aPurpose of Admiralty Radio Signals  aMaritime Security Threats