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. 3/8
First printing 1970
Second printing 1972
Revised edition
1976
Reprinted 1982, 1984
P-69
ISBN 92-5-100147-2
© French edition, Institut africain pour le d�veloppement
�conomique et social (lNADES) 1970
© English edition, FAO
1976