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Toward the end of the Qing dynasty in the early 20th century, scholars looked to Japan and the West for models. In the late 1890s, although deeply learned in the traditional forms, Liang Qichao began to publish extensive and influential studies and polemics that converted young readers to a new type of historiography that Liang regarded as more scientific. Liu Yizheng published several specialized history works including "History of Chinese Culture". This next generation became professional historians, training and teaching in universities. They included Chang Chi-yun, Gu Jiegang, Fu Sinian, and Tsiang Tingfu, who were PhDs from Columbia University; and Chen Yinke, who conducted his investigations into medieval Chinese history in both Europe and the United States. Other historians, such as Qian Mu, who was trained largely through independent study, were more conservative but remained innovative in their response to world trends. In the 1920s, wide-ranging scholars, such as Guo Moruo, adapted Marxism in order to portray China as a nation among nations, rather than having an exotic and isolated history. The ensuing years saw historians such as Wu Han master both Western theories, including Marxism, and Chinese learning.