Inventions that changed the world. 

 - Pleasantville, NY :  Readers Digest,  c1999. 
 - 160 p. : ill. (part col.) 
 - The eventful 20th century ; 4 .
<br/><br/> Includes index. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Inventions--History