Mathematics
Logic
Scientist
Department of Earth and Space Sciences University of Washington, 63 Johnson Hall, Box 351310, Seattle, WA 98195, USA
Absence of extraterrestrial ^3He in Permian-Triassic age sedimentary rocks [rapid communication]
Stable Isotope Results from the Permian/Triassic Boundary, South Africa, and Triassic/Jurassic Boundary, Western Canada: evidence against single strike impact as causes for these two mass extinctions
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