en.wikipedia.org
en.wikipedia.org
britannica.com
britannica.com
bbc.com
cso-yemen.org
CSO Yemen - Central Statistical Organisation
https://cso-yemen.org › history-of-yemen
nationsonline.org
Nations Online Project
https://www.nationsonline.org › oneworld › History › Yemen-history.htm
britannica.com
archive.org
worldofhistorycheatsheet.com
worldofhistorycheatsheet.com
https://worldofhistorycheatsheet.com › history-of-yemen
saba.ye
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