Frost F, Frank D, Pierson K, Woodruff L, Raasina B, Davis R, Davies J. A seasonal study of arsenic in groundwater, Snohomish County, Washington, USA. Environmental Geochemistry and Health 1993;15(4):209-214.Frost, F.; Frank, D.; Pierson, K.; Woodruff, L.; Raasina, B.; Davis,...