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Wangkahart, T and Toomsan, B and Pathak, P and Wani, S P (2005) Integrating Watershed Management for Land Degradation and Improving Agricultural Productivity in Northeast Thailand. In: Watershed Management Challenges Improving Productivity, Resources and Livelihoods. International Water Management Institute, Columbo, Sri Lanka, pp. 314-326. ISBN 92-9090-611 1