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. 3/21
First published 1970
Reprinted 1972, 1977, 1984
P-69
ISBN 92-5-100622-9
© French edition, Institut africain pour le d�veloppement
�conomique et social (INADES) 1967
© English edition, FAO
1970