Aspects of this topic are discussed in the following places at Britannica.
...direct supervision of the provincial government—Lan-chou itself; Chia-yü-kuan, at the western terminus of the Great Wall (which runs from northwest to southeast through the province); and Chin-ch’ang in the central sector of Kansu. Intermediate administrative divisions include eight prefectures (ti-ch’ü) and two autonomous prefectures (tzu-chih-chou)—the...
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