cdc.gov
cdc.gov
en.wikipedia.org
worldatlas.com
mappr.co
socialsci.libretexts.org
thoughtco.com
education.nationalgeographic.org
National Geographic Education
https://education.nationalgeographic.org › resource › united-states-regions
en.wikipedia.org
pressbooks.pub
Pressbooks Create
https://pressbooks.pub › worldgeography › chapter › 4-3
healthdata.org
Institute for Health Metrics and Evaluation
https://www.healthdata.org › sites › default › files › files › Projects › GBD › GBDRegions_countries.pdf
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