@INCOLLECTION {OKIGBO:1987a, title = {The Challenge of Teaching, Research and Indigenization of Courses as the Foundation for Self-sustaining Agriculture and Rational Natural Resource Management and Utilization, Akure}, author = {Okigbo, B. }, booktitle = {Annual Lecture}, series = {4}, year = {1987}, pages = {36 p}, organization = {Federal University of Technology}, address = {Akure}, }