A double mass extinction at the end of the paleozoic era. (Q34675173)
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(P31) (Q13442814)
(P50) (Q2347598)
(P304) 1340-1344
(P407) (Q1860)
(P433) 5189
(P478) 266
(P577) Tuesday, November 1, 1994
(P921) (Q75507)
(P1433) (Q192864)
(P1476) "A double mass extinction at the end of the paleozoic era." (language: en)
(P2093) Yang X
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