Crowther, J. G. <br/><br/>
Discoveries and inventions of the 20th century / 
J. G. Crowther. 
 - London :  Routledge & Kegan Paul,  c 1966. 
 - xix, 434 p. :  ill. ;  26 cm. 
<br/><br/> Includes index. 
<br/><br/>316  316 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Invention--20th century.--History
<br/><br/><label>Dewey Class. No.: </label>608.7 / C886d