Home Publications & Data Book Low input technology for managing oxisols and ultisols in Tropical America author(s) Sánchez, P.A. published in1980 original file download full citation Sánchez, Pedro A., Salinas, José G.. 1980. Low input technology for managing oxisols and ultisols in Tropical America. Centro Internacional de Agricultura Tropical (CIAT), Cali , CO. 203 p