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Geologic Map of Oregon
Oregon Department of Geology and Mineral Industries : Interactive Maps …
Geologic Map Series (GMS) - Oregon
Geologic Map Series (GMS) - Oregon.gov
Geologic map of Oregon | U.S. Geological Survey - USGS.gov
Geologic Map of Oregon - ArcGIS
ArcGIS Web Application - Oregon
Oregon: A Geologic History - Introduction
Geologic Map of Oregon
Oregon: A Geologic History - Additional Resources