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The Temple of Heaven on May Day 1976
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The CCP leadership celebrates May Day at Tiananmen in 1953
Zhou Enlai, Liu Shaoqi, Mao Zedong, Zhu De, Yang Shangkun, Gao Gang Source
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Participating in the 1957 May Day parade
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A family portrait on May Day 1957
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A May Day parade in Tiananmen in 1956
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Celebrating May Day in rural Yunnan in 1950
盐津县 Source
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Party leaders celebrate May Day in 1974
The photos includes 张春桥（左起）、纪登奎、苏振华、李富春、聂荣臻、周建人. It was taken at the Working People's Palace of Culture (i.e. the Imperial Ancestral Hall). Source
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May Day fireworks in Tiananmen in 1962
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May Day Celebration in Tiananmen in 1955
愿意平摄
Everyday Life in Mao's China 