Clough-Smith, J. H. <br/><br/>
An introduction to spherical trigonometry :  with practical examples, for students of navigation, hydrographic surveying and nautical astronomy / 
J.H. Clough-Smith. 
 - 2nd ed. 
 - Glasgow :  Brown, Son & Ferguson,  1978. 
 - viii, 114 p. :  ill. ;  22 cm. 
<br/><br/>Bibliography: pviii. 
<br/><br/><label>ISBN: </label>085174320X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Navigation--Mathematics.<br/>Spherical trigonometry.
<br/><br/><label>Dewey Class. No.: </label>623.89