United Kingdom Hydrographic Office <br/><br/>
Admiralty List of Radio Signals Vol:6(4) 

 - 1st 
 -  United Kingdom hydrographic O  2007 
<br/><br/> YES 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Marine engg. Marine 
<br/><br/><label>Dewey Class. No.: </label>