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References
- ↑ U.S. Geological Survey Geographic Names Information System: Killdeer Mountains
- ↑ Quirke, Terence T. (April 1918). "The Geology of the Killdeer Mountains, North Dakota". The Journal of Geology. 26 (3): 255.
- ↑ Federal Writers' Project (1938). North Dakota, a Guide to the Northern Prairie State,. WPA. p. 321. ISBN 978-1-62376-033-5.
- ↑ https://www.willistonherald.com/community/killdear-volcano/article_2012f178-e38f-11e9-8d29-cbc85d80f044.html
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