Analysis of information sources in references of the Wikipedia article "Gansu" in English language version.
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Hua'er is a form of Chinese folk music that is widely disseminated in the Gansu, Qinghai, Ningxia, and Xinjiang Provinces located in north-western China. It is performed among the Han and nine other ethnic minorities...
With the exploration efforts of Sun Jianchu, Yan Shuang and other patriotic scholars, on August 11, 1939, the Laojunmiao oil well blew out the first oil. This moment has also become the starting point of China's petroleum industry. During the Anti-Fascist War against the Imperial Japanese forces, the Yumen oil wells produced a total of 250,000 tons of crude oil, accounting for more than 90% of the country's crude oil output during the same period, making an important contribution to the victory toward the Anti-Fascist War.