Why people move :  comparative perspectives on the dynamics of internal migration / 
edited by Jorge Balan. 
 - Paris :  Unecso Press,  1981. 
 - 342 p. :  ill. ;  20 cm. 
<br/><br/> This work is the outcme of an international symposium held in Cuernavaca, Mexico, 18-21 September 1978, and organised under the auspices of Unesco and the Latin American Social Sciences Council (CLACSO) Committee on Population and Development. 
<br/><br/><label>ISBN: </label>9231019090