World urbanization prospects 1990 :  estimates and projections of urban and rural populations and of urban agglomerations / 
Department of International Economic and Social Affairs. 
 - New York :  United Nations,  1991. 
 - viii, 223 p. : 
<br/><br/> "ST/ESA/SER.A/121"--T.p. verso 
<br/><br/><label>ISBN: </label>GDB910 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Rural-urban migration
<br/><br/><label>Dewey Class. No.: </label>307.76  / Wo