Clark, Colin. <br/><br/>
The conditions of economic progress / 
Colin Clark. 
 - 3rd ed. 
 - London :  Macmillan,   1957. 
 - xiv, 720 p. :  ill. ;  22 cm. 
<br/><br/> Index includes. 
<br/><br/>326  326 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Economic progress.
<br/><br/><label>Dewey Class. No.: </label>330.9 / C547c