Farming systems research and development : guidelines for developing countries / Shaner, W. W. Philipp, P. F. Schmehl, W. R. Consortium for International Development. Agriculture Agricultural systems Agriculture Agricultural systems 338 WES 1982 A077 Or. At head of title: A Consortium for International Development study. Includes index. Boulder, Colo. : Westview Press, 1982. 1982. Text 414 p. :