Witherby Seamanship <br/><br/>
Passage planning principles / Witherbys Seamanship Publication. 

 -  Edinburg : Witherby Publishing Group  2006 
 - vii, 60p. : ill. (some col. )31 cm. Includes Bibliographical refernces. 
<br/><br/><label>ISBN: </label>9781856093224 
<br/><br/><label>LC Class. No.: </label>VK145 .P373 2006 
<br/><br/><label>Dewey Class. No.: </label>VK145 .P373 2006 
<br/><br/><label>National Library of Medicine Call No.: </label>VK145 .P373 2006