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Dinosaur Census Reveals Abundant Tyrannosaurus and Rare Ontogenetic Stages in the Upper Cretaceous Hell Creek Formation (Maastrichtian), Montana, USA
- John R. Horner,
- Mark B. Goodwin,
- Nathan Myhrvold
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- Published: February 9, 2011
- https://doi.org/10.1371/journal.pone.0016574