Agricultural extension in the developing countries
de Vries, C.A.
Agricultural extension in the developing countries - Wageningen 1968 - 125 p. - No. 7; Netherlands Internation .
63(071.7):016:330.19
Agricultural extension in the developing countries - Wageningen 1968 - 125 p. - No. 7; Netherlands Internation .
63(071.7):016:330.19