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2. Earth Science Education & Science Movement (Chigaku Kyoiku to Kagaku Undo), Special Edition, 1997; 14-27.
3. Proceedings of International Conference on Arsenic in Groundwater: Cause, Effect and Remedy, Calcutta, India. 1995; 3.
4. Arsenic poisoning in the Ganges delta
5. Arsenic poisoning of Bangladesh groundwater