These images appear to all be from 1974, when the submarine was completed. Source Source 2
China’s first nuclear powered submarine
A collection: Little Red Guards
Source
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A group photo with Zhu De at the Ziyang Train Station in 1964
August 24, 1964 Source Source 2 provides a memoir this photo.
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Yang Houzhen Long Marcher
For more see Source. This interview discusses a book on the only thirty women involved in the Long March.
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Mao and Zhu De at Yanan in 1945
Source
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A collection: China helps build the Tanzania Railway 1968-1975
Source
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A collection: Little Red Guards of 1966
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Mao examines China’s first sounding rocket in 1960
The photo wast taken in Shanghai in May 1960. Source
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Taiwanese stars perform for troops in Jinmen in 1955
May 25, 1995 Source
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Enlarged meeting of the Central Military Commission in 1958
Source
Everyday Life in Mao's China 