History of the Sui Dynasty, thirteenth of the 24 dynastic histories 二十四史[Er4 shi2 si4 Shi3], compiled under Wei Zheng 魏徵|魏征[Wei4 Zheng1] in 636 during Tang Dynasty, 85 scrolls
thirteenth special session of the General Assembly / special session of the General Assembly on the critical economic situation in Africa
The four tones
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