Farmers' estimations as a source of production data :
Murphy, Josette.
Farmers' estimations as a source of production data : methodological guidelines for cereals in Africa / Josette Murphy ; Dennis J. Casley ; John J. Curry. - Washington, D.C. : World Bank, c1991. - 71p. : 28cm - Africa Technical Department series no. 132. 0253-7494 ; .
Farmers' estimations as a source of production data : methodological guidelines for cereals in Africa / Josette Murphy ; Dennis J. Casley ; John J. Curry. - Washington, D.C. : World Bank, c1991. - 71p. : 28cm - Africa Technical Department series no. 132. 0253-7494 ; .