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Kindergartners perform at the Shengli oil field in 1972
Source
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
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An Idyllic Oil Field, Gu Yuan, 1978
水乡油田， 古元， 1978
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Everyday Life in Mao's China 