Revision as of 12:46, 13 April 2023 by Sky(talk | contribs)(Created a new Item: 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.)