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Published by arrangement with the
Institut africain pour le
d�veloppement �conomique et social
B.P. 8008, Abidjan, C�te d'Ivoire
FOOD AND AGRICULTURE ORGANIZATION OF THE UNITED NATIONS
Rome
1976
FAO Economic and Social Development Series No. 3/5
First edition 1970
Reprinted 1972
Second edition, revised,
1976
Reprinted 1983,1994
P-69
ISBN 92-5-100144-8
© French edition, Institut africain pour le d�veloppement
�conomique et social (INADES) 1970
© English edition, FAO
1976