Brill, K., and K. Carpenter (2006). A description of a new ornithopod from the Lytle Member of the Purgatoire Formation (Lower Cretaceous) and a
reassessment of the skull of Camptosaurus; pp. 49-67 in K. Carpenter (ed.), Horns and Beaks: Ceratopsian and Ornithopod Dinosaurs. Indiana University Press, Bloomington.

Describes Theiophytalia kerri, erected for the partial skull YPM 1887, which is the specimen used by Marsh to restore the skull of Camptosaurus.
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Galton, P. M. (2006) Teeth of ornithischian dinosaurs (mostly Ornithopoda) from the Morrison Formation (Upper Jurassic) of the western United States;
pp. 17-47 in K. Carpenter (ed.), Horns and Beaks: Ceratopsian and Ornithopod Dinosaurs. Indiana University Press, Bloomington.[Othnielosaurus]

Reviews and illustrates pretty much all that which is said in the title. A new genus, Othnielosaurus, is erected for the former Laosaurus consors.
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Gilpin, D., T. DiCroce, and K. Carpenter. (2006) A possible new basal hadrosaur from the Lower Cretaceous Cedar Mountain Formation of eastern Utah; pp. 79-89 in K. Carpenter (ed.), Horns and Beaks: Ceratopsian and Ornithopod Dinosaurs. Indiana University Press, Bloomington.

Cedrorestes crichtoni, based on associated postcrania from the top of the Yellow Cat Member of the Cedar Mountain Formation.
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Paul, G. S. (2006) Turning the old into the new: a separate genus for the gracile iguanodont from the Wealden of England; pp. 69-77 in K. Carpenter (ed.), Horns and Beaks: Ceratopsian and Ornithopod Dinosaurs. Indiana University Press, Bloomington.

Iguanodon atherfieldensis is renamed Mantellisaurus atherfieldensis.