based on papers presented at a workshop held at the Centro Internacional de Agricultura Tropical, March 9-13, 1981 Graham, Peter H Harris, Susan C Centro Internacional de Agricultura Tropical text Cali, Colombia Centro Internacional de Agricultura Tropical 1982 monographic xv, 726 p. : ill. ; 24 cm Nitrogen Nitrogen-fixing microorganisms Agriculture 589 CEN 1982 C143 Or. 8489206228