Sonnenberg, Gerrit Jacobus, 1903-. <br/><br/>
Radar and electronic navigation 
by G. J. Sonnenberg. 
 - 4th ed. 
 - New York  Van Nostrand Reinhold  1970 
 - viii, 312 p. : ill., charts (part col.) ; 23 cm. 
<br/><br/><label>LCCN: </label>72-017843 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Electronics in navigation