J. R Knapton

• Arsenic and chloride data for five stream sites in the Madison River drainage, Montana, 1988
• Arsenic data for streams in the upper Missouri River Basin, Montana and Wyoming
• Field guidelines for collection, treatment, and analysis of water samples, Montana district
• Quality assurance for water-quality activities of the U.S. Geological Survey in Montana
• Reconnaissance investigation of water quality, bottom sediment, and biota associated with irrigation drainage in the Sun River area, west-central Montana, 1986-87
• Supplemental arsenic data for selected streams in the Missouri River basin, Montana, 1987