00287nam a2200109Ia 4500082002600000100001600026245007500042260003500117300001500152500000500167700000500172  a338.13096897bD281.SR  aDean, Edwin  aSupply responses of African farmers theory and measurement in Malawib  aAmsterdambNorth-Hollandc1966  axiv, 174p.  a  a