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paleogene stratigraphic unit of north america(expression, geohistory, unit, paleontology)
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APASmart Define. (1970). paleogene united states thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/paleogene_united_states/thesaurus/broader
ChicagoSmart Define. 1970. "paleogene united states thesaurus" https://smartdefine.org/paleogene_united_states/thesaurus/broader (accessed September 21, 2026).
HarvardSmart Define 1970, paleogene united states thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/paleogene_united_states/thesaurus/broader>.
MLASmart Define. "paleogene united states thesaurus" 1 January 1970. Web. 21 September 2026. <https://smartdefine.org/paleogene_united_states/thesaurus/broader>