United Kingdom Hydrographic Office <br/><br/>
Admiralty List of Radio Signals Vol:II 

 - 1st 
 -  United Kingdom hydrographic O  2005 
<br/><br/> YES 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Radio Marine 
<br/><br/><label>Dewey Class. No.: </label>