The Suiyuan reference article from the English Wikipedia on 24-Apr-2004
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Suiyuan

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A part of Inner Mongolia since 1954, Suīyuǎn (綏遠) was a Chinese province. It became a part of Mengjiang from 1937 to 1945 under Japanese rule. Suiyuan's capital was Hohhot.

The province is named after a district in the capital established in the Qing Dynasty.