@MANUAL {IITA:2015, title = {Geographical Information System (GIS) Training Course for Agricultural Research in Africa}, author = {IITA, }, year = {2015}, organization = {IITA}, note = {GIS Training at the International Institute of Tropical Agriculture (IITA), Oyo Road, Ibadan, Nigeria, May 11-15, 2015; Learning Material; 149p.}, }