# wombat urls ß PLOS Collections: Dinosaur Census Reveals Abundant Tyrannosaurus and Rare Ontogenetic Stages in the Upper Cretaceous Hell Creek Formation (Maastrichtian), Montana, USA
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Research Article

Dinosaur Census Reveals Abundant Tyrannosaurus and Rare Ontogenetic Stages in the Upper Cretaceous Hell Creek Formation (Maastrichtian), Montana, USA

  • John R. Horner mail,

    jhorner@montana.edu

    Affiliation: Museum of the Rockies, Montana State University, Bozeman, Montana, United States of America

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  • Mark B. Goodwin,

    Affiliation: Museum of Paleontology, University of California, Berkeley, California, United States of America

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  • Nathan Myhrvold

    Affiliation: Intellectual Ventures, Bellevue, Washington, United States of America

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  • Published: February 09, 2011
  • DOI: 10.1371/journal.pone.0016574
  • Published in PLOS ONE

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