Admiralty list of radio signals, volume 6, part 4 : pilot services, vessel traffic services and port operations: Indian Sub-continent, South East Asia 

 -  The United Kingdom Hydrographic Office.  2013 
 - xxii, 362 pages 
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<br/><br/><label>Subjects--Topical Terms: </label><br/>Radio in navigation.
<br/><br/><label>Dewey Class. No.: </label>M 623.89 A2388 2013