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WikiPedia: Hán_tứ_quận http://www.shsu.edu/~his_ncp/Korea.html http://www.chinaheritagequarterly.org/scholarship.... https://docs.google.com/viewer?a=v&q=cache:_ntNpkm... https://archive.org/details/isbn_9780962771309 https://archive.org/details/isbn_9780962771309/pag... https://web.archive.org/web/20150625032709/http://...