Published by arrangement with the
Institut africain pour le
dveloppement conomique et social
B.P. 8008, Abidjan, Cte d'Ivoire
FOOD AND AGRICULTURE ORGANIZATION OF THE UNITED NATIONS
Rome
1976
FAO Economic and Social Development Series No. 3/4
First edition 1970
Reprinted 1972
Second edition, revised,
1976
Reprinted 1983, 1986
P-69
ISBN 92-5-100143-X
© French edition, Institut africain pour le dveloppement
conomique et social (INADES) 1970
© English edition, FAO
1976