Mitchell, J. V.  <br/><br/>
Principles of navigation /  
J. V. Mitchell.  
 - London :   Mayflower trading co. ltd,   c1973.  
 - 76 p. ;   19 cm.  
<br/><br/><label>Subjects--Index Terms: </label>The prime vertical problem.  Time calculation.  Miscellaneous problems.  
<br/><br/><label>Dewey Class. No.: </label>623.89  / MIT