An introduction to GMDSS 
Olsen, Jann M. 
 - 4th edition. 
 -  Infosearch and ventures development corporation.  1998 
 - 222 pages. 
<br/><br/>
<br/><br/><label>ISBN: </label>8-29926506-1 
<br/><br/><label>Dewey Class. No.: </label>M 623.8932 O522 1998