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4 entries under period topic. ×

5
cretaceous-paleogene boundary(expression, extinction, paleogene)
5
oligocene extinction(expression, extinction, paleogene)
4
eocene extinction(expression, extinction, paleogene)
2
Paleogene genus extinction(expression, extinction, paleogene)
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APASmart Define. (1970). paleogene species extinction thesaurus. Retrieved October 1, 2026, from https://smartdefine.org/paleogene_species_extinction/thesaurus/related
ChicagoSmart Define. 1970. "paleogene species extinction thesaurus" https://smartdefine.org/paleogene_species_extinction/thesaurus/related (accessed October 1, 2026).
HarvardSmart Define 1970, paleogene species extinction thesaurus, Smart Define, viewed 1 October, 2026, <https://smartdefine.org/paleogene_species_extinction/thesaurus/related>.
MLASmart Define. "paleogene species extinction thesaurus" 1 January 1970. Web. 1 October 2026. <https://smartdefine.org/paleogene_species_extinction/thesaurus/related>