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South Yemen - Wikipedia
Yemeni unification - Wikipedia
Yemen’s Tragedy: War, Stalemate, and Suffering
Yemen country profile - BBC News
Who is fighting in Yemen's war? | Reuters
Yemen - United States Institute of Peace
Yemen’s Socialist Experiment Was a Political Landmark for
Yemen: A Brief Background | unfoundation.org - United Nations …
Timeline: History of separatism in southern Yemen - Al Jazeera
Yemen war: Separatists declare autonomous rule in south - BBC