@BOOK {SMITH:1992, title = {Socioeconomic characterization of environments and technologies in humid and sub-humid regions of West and Central Africa: RCMP Research monograph, No. 10}, author = {Smith, J. }, series = {RCMP Research monograph, No. 10}, year = {1992}, publisher = {International Institute of Tropical Agriculture (IITA)}, address = {Ibadan, Nigeria}, note = {15p.}, }