Those inventive Americans. 
Produced by the National Geographic Special Publications Division. Foreword by Leonard Carmichael. 
 - [Washington,  National Geographic Society,  c1971 
 - 231 p.  illus. (part col.), ports. (part col.)  27 cm. 
 - [National geographic special publications] .
<br/><br/><label>ISBN: </label>0870440896 
<br/><br/><label>LCCN: </label>75125340 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Inventors--United States.
<br/><br/><label>LC Class. No.: </label>T39  / .T5 
<br/><br/><label>Dewey Class. No.: </label>609/.73