石景山钢铁厂 Source
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Beijing steel workers study Chinese after work in 1950
Sino-Vietnamese War film: Wreaths at the Foot of the Mountain 1979
https://www.youtube.com/watch?v=4yZCo_cVKtI
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Guiyang No. 1 High School students and teachers to link up with fellow revolutionaries in 1966
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A large collection: militias building the Minjiang hydropower station, 1971-1973
Guangdong Source
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傅抱石，比加兹水电站水泥厂, 1957
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