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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1958 Sep 15;44(9):973–977. doi: 10.1073/pnas.44.9.973

TETRAPOD EXTINCTIONS AT THE END OF THE TRIASSIC PERIOD

Edwin H Colbert 1
PMCID: PMC528676  PMID: 16590299

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