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Use sources later http://www.bjreview.com.cn/nation/txt/2015-09/01/content_702282.htm http://www.chinabookinternational.org/2015/0424/93379_en.shtml https://www.dailypioneer.com/2016/columnists/tengchong-a-forgotten-episode-in-northern-theatre.html https://www.scmp.com/lifestyle/travel-leisure/article/2150410/five-things-do-chinas-volcanic-city-tengchong-hiking http://www.chinatoday.com.cn/english/report/2015-08/27/content_701672.htm http://www.dontow.com/2009/08/heroic-and-critical-battles-in-yunnan-during-wwii/