TY  - BOOK
ED  - UK Hydrographic Office
TI  - Admiralty list of radio signals : global maritime distress and safety system ( GMDSS) : NP285 - volume 5 
SN  - 978077747026
U1  - 623.8 
PY  - 2020///
CY  - United Kingdom
PB  - UK Hydrographic Office
ER  -