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WikiPedia: Pukchang http://nk.joins.com/map/i054.htm http://www1.korea-np.co.jp/pk/087th_issue/99032502... http://www.hrnk.org/download/The_Hidden_Gulag.pdf http://unstats.un.org/unsd/demographic/sources/cen... https://web.archive.org/web/20110621220846/http://...