R. D. Cotter

1929

• Exploratory drilling for ground water in the Mountain Iron-Virginia area, St. Louis county, Minnesota
• Ground and surface water in the Mesabi and Vermilion Iron Range area northeastern Minnesota
• Water resources in the vicinity of municipalities on the eastern Mesabi Iron Range and the Vermillian Iron Range northeastern Minnesota
• Water resources in the vicinity of municipalities on the western Mesabi iron range northeastern Minnesota