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paleogene stratigraphic unit of north america(expression, unit, paleontology)
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APASmart Define. (1970). challis volcanics thesaurus. Retrieved October 2, 2026, from https://smartdefine.org/challis_volcanics/thesaurus/broader
ChicagoSmart Define. 1970. "challis volcanics thesaurus" https://smartdefine.org/challis_volcanics/thesaurus/broader (accessed October 2, 2026).
HarvardSmart Define 1970, challis volcanics thesaurus, Smart Define, viewed 2 October, 2026, <https://smartdefine.org/challis_volcanics/thesaurus/broader>.
MLASmart Define. "challis volcanics thesaurus" 1 January 1970. Web. 2 October 2026. <https://smartdefine.org/challis_volcanics/thesaurus/broader>