Usher, Abbott Payson,    1883- <br/><br/>
A history of mechanical inventions /    
A. P. Usher. 
 - Boston :   Beacon Press,   1959. 
 - 450p. :    ill. ;    21cm. 
 - Beacon paperback ;   no. 84. .
<br/><br/>Includes bibliographical references. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Inventions --History.------<br/>Machinery --History.------
<br/><br/><label>Dewey Class. No.: </label>608.7