Chen Yun visited on June 26, 1952. Source
A collection: Chen Yun inspects the Yumen oilfield in 1958
A collection: Backyard steel furnaces at the Yumen oilfield in 1958
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Yumen oil workers hold a ceremony for China’s first self made large-type drill in 1960
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A collection: The Yumen oilfield, 1950-1954
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Analyzing soil samples at the Yumen oil field in 1954
Yumen in Gansu province was the site of the People Republic of China's first oil well and oil field. Source
Everyday Life in Mao's China 