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

 - 1 st 
 -  United Kingdom hydrographic O  2008 
<br/><br/> YES 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Marine engineering Marine 
<br/><br/><label>Dewey Class. No.: </label>