Twelve inventions that changed the world 

 - s.l.  United States Information Services  n.d. 
 - 45p.  ill.  23cm 
 - American civilization series  no.2 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Inventions
<br/><br/><label>Dewey Class. No.: </label>608  / TWE