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Rural-urban migration and its relation to unemployment in the urban area of Valle del Cauca, Colombia
Roa Mejia, Alfredo, (1974)
Demographic conditions of economic development in Latin America
Schultz, T. Paul, (1968)
Pakistan : a demographic report
Burki, Shahid Javed, (1973)
Derechos humanos ... derechos del pueblo?
Angulo, Alejandro, (1980)
Female participation in economic activity in Colombia : International Labour Office
Angulo, Alejandro, (1975)
La situación social en Colombia
Angulo Novoa, Alejandro, (1979)