@BOOKLET {MUTSAERS:1991e, title = {Opportunities for second cropping in southwestern Nigeria: RCMP Research monograph, No. 4}, author = {Mutsaers, H. J. W. }, year = {1991}, address = {International Institute of Tropical Agriculture (IITA)}, howpublished = {RCMP Research monograph, No. 4}, note = {CRP; Grain Legumes; Soybean; Cowpea; 28p.}, }