Weaver, Henry Grady. <br/><br/>
The mainspring of human progress / 
by Henry Grady Weaver. 
 - Revision ed. 
 - New York :  The Foundation for Economic Education,  1953. 
 - 287 p. ;  18 cm. 
<br/><br/><label>ISBN: </label>0910614024 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Liberty.