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Data map: 31,350 ground-water arsenic samples collected in 1973-2001

Citation--
Ryker, S.J., Nov. 2001, Mapping arsenic in groundwater: Geotimes v. 46 no. 11, p. 34-36.

Alternate formats--
 PDF in red/yellow/green (1.4 Mb)

Original map (Welch and others, 2000)--
 The May 2000 data map showed 18,850 ground-water samples collected in 1973-1997. The map below shows 31,350 ground-water samples collected in 1973-2001.

Map-- Arsenic concentrations in 31,000 ground-water samples

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