Recommendation on Basic Principles and Operational guidance relating to Navigational Watchkeeping / 

 - London :  Intergovernmental Maritime Consultative Organization,  1974. 
 - 12 p. ;  24 cm. 
<br/><br/><label>ISBN: </label>9280110322 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Merchant marine--Watch duty.
<br/><br/><label>Dewey Class. No.: </label>623.892  / In818