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Extraterrestrial Cause for the Cretaceous-Tertiary Extinction
Luis W. Alvarez; Walter Alvarez; Frank Asaro; Helen V. Michel
Science, New Series, Vol. 208, No. 4448. (Jun. 6, 1980), pp. 1095-1108.
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http://www.jstor.orgTue Feb 6 11:14:45 2007