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The following HTML text is provided to enhance online readability. Many aspects of typography translate only awkwardly to HTML. Please use the page image as the authoritative form to ensure accuracy. 6. Space Studies Board, National Research Council, The Search for Life's Origins: Progress and Future Directions in Planetary Biology, National Academy Press, Washington, D.C., 1990, p. 47. 7. S.R. Taylor and M.D. Norman, “Accretion of differentiated planetesimals to the Earth,” pp. 29–44 in Origin of the Earth, H.E. Newsom and J.H. Jones, eds., Oxford University Press, New York, 1990.
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