In the first year of the Republic of China (1912), the Swiss Xinchangfu went to the Baotou Shijiao area to carry out a geological survey of coalfields. This is the first geological survey of the Daqingshan Coalfield. Δ in the south of the shiqiu mining area of present-day Baotou City...
Stone turn area republic Baotou County Republic of China Big Green Mountain
12-15