@INPROCEEDINGS {OKIGBO:1974c, title = {Fitting research to farming systems: based on observations and preliminary studies of traditional agriculture in Eastern Nigeria: paper presented at the Second International Seminar on Change in Agriculture, Reading, 9-19 Sept., 1974}, author = {Okigbo, B. }, booktitle = {Fitting research to farming systems: based on observations and preliminary studies of traditional agriculture in Eastern Nigeria}, year = {1974}, month = {September}, pages = {1--37}, }