Those inventive Americans / 
Produced by the National Geographic Special Publications Division. Foreword by Leonard Carmichael. 
 - [Washington :  National Geographic Society,  1971. 
 - 231 p. :  ill. 
 - [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.
<br/><br/><label>Dewey Class. No.: </label>609