Zimmerman, L. J. <br/><br/>
Poor lands, rich lands :  the widening gap / 
L.J. Zimmerman. 
 - New York :  Random House,  c1965. 
 - 170 p. 
 - Studies in economics .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Developed countries--Economic conditions.