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Alvarez, W., L.W. Alvarez, F. Asaro, and H.V. MichelThe end of the Cretaceous: Sharp boundary or gradual transition? Science, 223, Bohor, B.F., E.E. Foord, P.J. Modreski, and D.M. TriplehornMin
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Document Date: 2011-05-06 22:21:46
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Alvarez, W., L.W. Alvarez, F. Asaro, and H.V. MichelThe end of the Cretaceous: Sharp boundary or gradual transition? Science, 223, Bohor, B.F., E.E. Foord, P.J. Modreski, and D.M. TriplehornMin