These images appear to all be from 1974, when the submarine was completed. Source Source 2
China’s first nuclear powered submarine
Guangzhou Train Station in 1976
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A parade to celebrate’s Shanghai liberation in 1949
July 6, 1949. Source
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Parading Tractors for the Nation’s Birthday in Downtown Chengdu, 1958
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A Family in the Streets of Beijing, May 1, 1977
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A collection: Daily life in Shanghai in 1964
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China’s First 10,000 ton seagoing freighter in 1958
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The future location of the Gezhouba Dam in 1957
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颜文樑, 枫桥夜泊 ,1960
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Everyday Life in Mao's China 