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WikiPedia: Thú tiền sử http://www.paleocene-mammals.de/index.htm http://ib.berkeley.edu/courses/ib173/lectures/lect... http://www.fmnh.helsinki.fi/users/haaramo/ https://archive.org/details/macmillanillustr0000un... https://web.archive.org/web/20051105004347/http://... https://web.archive.org/web/20160306162825/http://...