Published by arrangement with the
Institut africain pour la
d�veloppement �conomique et social
B.P. 8008, Abidjan, C�te d'Ivoire
FOOD AND AGRICULTURE ORGANIZATION OF THE UNITED NATIONS
Rome
1977
FAO Economic and Social Development Series No. 3/17
First printing 1970
Second printing 1972
Third printing
1977
P-69
ISBN 92-5-100619-9
© French edition, Institut africain pour le d�veloppement
�conomique et social (INADES) 1967
© English edition, FAO
1970