Jewkes, John <br/><br/>
The Sources of Invention 

 - London:  Great Britain,  1969. 
 - 372p.  22cm 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Inventions & patents
<br/><br/><label>Dewey Class. No.: </label>608.7  / JEW