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160 T.M. Harrison, J. Blichert‐Toft, W. Müller, F. Albarède, P. Holden, and S.J. Mojzsis (2005) Heterogeneous Hadean Hafnium: Evidence of continental crust at 4.4 to 4.5 Ga. Science 310, 1947‐1950 doi:10.1126/science.1117926. [pdf] summary