Burlingame, Roger. <br/><br/>
Engines of democracy :  inventions and society in mature America /  
Roger Burlingame. 
 - New-York :  Charles Scribner's,  c 1940. 
 - xviii, 606 p. :  ill. ;  24 cm. 
<br/><br/> Includes index. 
<br/><br/>338  338 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Patents.
<br/><br/><label>Dewey Class. No.: </label>608 / B925e