National Geologic Map Database
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                Title: Geographic range of Tytthodiscus extended to Alaska
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                Author(s): Waloweek, W., and Norem, W.L.
            
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                    Publishing Organization: The Paleontological Society
            
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                Series and Number: Journal of Paleontology v. 31, no. 3 [p. 674-675]
            
- Publication Date: 1957
- Cross Section: None
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* Names and boundaries are not necessarily authoritative, and are provided here solely for general orientation.