When was Inner Mongolia’s former territory restored after the 1969 boundary changes?

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Wide autumn valley with golden grass in the foreground and low, tree-covered mountains of the Greater Khingan Range in the distance under a clear sky. — Inner Mongolia Da Hinggan (Greater Khingan) Range, southeast of Hailar, Inner Mongolia Autonomous Region, China.

The reorganization that significantly reduced the size of the Inner Mongolia Autonomous Region in 1969 was terminated in 1979, at which time the territory detached during the 1969 boundary changes was restored to the region.1