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- 12:46, 13 April 2023 Sky talk contribs created page A geologic time scale, 1989 (Q26270) (wbeditentity-create:2|en: A geologic time scale, 1989, Harland, W.B., Armstrong, R.L., Cox, A.V., Craig, L.E., Smith, A.G., and Smith, D.G., 1990, A geologic time scale, 1989: Cambridge, U.K., Cambridge University Press, 263 p.)
