Ritchie, George Stephen <br/><br/>
Challenger  the life of a survey ship 
by George Stephen Ritchie 
 - London  Hollis & Carter  1957 
 - 249 p. : ill. ; 23 cm. 
<br/><br/> includes index 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ships--Seakeeping