Trewarth G.T <br/><br/>
Discovery by chance; 
Glennt Trewartha Arthur H. Robinson... [at..el] 
 - New York,  McGraw-Hill,  [1977] 
 - viii, 376 p.  illus.  24 cm. 
<br/><br/>Bibliography: p. 176-179. 
<br/><br/><label>Source: </label>B-7369 
<br/><br/><label>LCCN: </label>68021129  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Science--Juvenile literature.
<br/><br/><label>LC Class. No.: </label>GB55.T73 1977  / .T73 1977