https://www.youtube.com/watch?v=jF6eMcn-Zi0
A collection: Troops on the Soviet border in 1977
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A collection: The Sino-Indian Border Conflict of 1962
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British Pathe newsreel: Thousands pass into China from Hong Kong for anniversary in 1956
It appears that this is for entry into Guangzhou. Source
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Crossing the Border Between Shenzhen and Hong Kong, 1950
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Everyday Life in Mao's China 