Workbook in terrestrial navigation 1 
Ynion, Eugenio J. 
 -  Philippine Foundation for Maritime Teaching Aids, Inc.  2001 
 - 33 pages. 
<br/><br/>
<br/><br/><label>ISBN: </label>9-71923754-6 
<br/><br/><label>Dewey Class. No.: </label>M 623.89 Y6w 2001