National Geologic Map Database
Product Description Page
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Title: Hydrology of the Helena area bedrock, west-central Montana, 1993-98, with a section on geologic setting and a generalized bedrock geologic map
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Author(s): Thamke, J.N., and Reynolds, M.W.
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Publishing Organization: U.S. Geological Survey
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Series and Number: Water-Resources Investigations Report 2000-4212
- Publication Date: 2000
- Map Scale: 1:100,000
- Cross Section: None
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* Names and boundaries are not necessarily authoritative, and are provided here solely for general orientation.