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Johansen, C and Virmani, S M and Lai, T V and Nam, N H and Nigam, S N (1993) Use of Environmental Information Systems in Analyzing Crop Adaptation and Product ion Constraint s as an Aid to On- farm Research. In: Approaches to on-farm research in Asia: summary proceedings of the Regional Workshop on On-farm Adaptive Research, 18-20 Feb. 1993, Ho Chi Minh City, Vietnam.