Project 1099: J. B. Scannella, D. W. Fowler, M. B. Goodwin, J. R. Horner. 2014. Evolutionary Trends in Triceratops from the Hell Creek Formation, Montana. Proceedings of the National Academy of Sciences. 111.
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Scannella, J.B., Fowler. 2014. Evolutionary Trends in Triceratops from the Hell Creek Formation, Montana. Proceedings of the National Academy of Sciences. Vol. 111.