El Correo de la UNESCO: una ventana abierta sobre el mundo, XXVII, 7/8 | https://unesdoc.unesco.org/ark:/48223/pf0000074876_spa
Electronic | Paper | online resource
Edited and abridged version of a study presented at an African seminar on population and economic development, Dar-es-Salam, Tanzania, May 1974, which study has also been published by "Ceres", FAO Review on Development, Rome.
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