Home Publications & Data Conference Paper Efficiency of energy production in maize-bean and other mixed cropping systems author(s) Francis, C.A. published in1973 original file download full citation Francis, Charles Andrew; Heichel, Gary H. 1973. Efficiency of energy production in maize-bean and other mixed cropping systems. Centro Internacional de Agricultura Tropical (CIAT), Cali, CO. 7 p.