These images appear to all be from 1974, when the submarine was completed. Source Source 2
China’s first nuclear powered submarine
Liu Shaoqi inspects the future site of the Three Gorges Dam in 1960
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The future location of the Gezhouba Dam in 1957
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李梅树， 三峡风光， 1957
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Watching an open-air movie in 1952
The image was taken at the construction site for the project to divert flood waters from the Jing River in Hubei. Source
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Rebels parade dead comrades around Wuhan on July 15th 1967
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Children draw a portrait of Lenin in art class in Hongan County in 1960
Source 新华社记者 刘心宁 摄
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Wu Zuoren on a boat near the Three Gorges in May 1938
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Contraband collected from a rebellion in rural Hubei in 1955
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Collecting the harvest in 1975
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Everyday Life in Mao's China 