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Map of dissolved As in shallow groundwater of Bangladesh based on a survey of 1500 tubewells <30 m deep out of a total of 3500 sampled across the country (2). The location of tubewells >30 m deep is indicated by white circles. Labeled triangles indicate the location of 6 needle-sample profiles collected in Birganj (NS19 and 20), Araihazar (NS6 and 7), and Lakshmipur (NS21 and NS23). Only in Birganj can the locations of the two profiles be distinguished at this scale.
