Book
Wooley, JN
Wooley, Jonathan N., Vallejo, R.A., Prager Mosquera, Martín. 1988. Identifying appropriate technologies for farmers : The case of the bean + maize system in Ipiales, Colombia, 1982-1986. Centro Internacional de Agricultura Tropical (CIAT); Instituto Colombiano Agropecuario (ICA), Cali, CO. 76 p. (Working document no. 31)