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Cambridge Histories Online

Full-Text Republic Books Database

China Academic Digital Associative Library (CADAL)

Hathi Trust Digital Library

Policies and Laws of China (PLOC)

Duxiu

China Local Records 1 and 2

Zhongguo Wen Shi Zi Lao (2)

China Maxx Digital Library of Chinese E-books

Zhongguo Wen Shi Zi Lao (1)