National Geologic Map Database
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                Title: Permian volcanism in western North America
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                Author(s): Wheeler, E.A.
            
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                    Publishing Organization: University of California Press
            
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                Series and Number: Pacific Science Congress, 6th, Berkeley, CA, 1939, Proceedings v. 1 [p. 369-376]
            
- Publication Date: 1940
- Cross Section: None
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* Names and boundaries are not necessarily authoritative, and are provided here solely for general orientation.