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Reconstruction of Albertaceratops nesmoi, a new centrosaurine horned dinosaur from the Late Cretaceous of southernmost Alberta, Canada. © 2007 Michael Skrepnick.

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The skull of the new horned dinosaur, Albertaceratops nesmoi, in the collections of the Royal Tyrrell Museum, Alberta, Canada. Reconstruction by Donna Sloan/RTMP. Courtesy of Michael. J Ryan and the RTMP.

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Dr. Michael J. Ryan in 2007at the quarry of the new horned dinosaur, Albertaceratops nesmoi, on the Pinhorn Grazing Reserve of southern, Alberta, Canada. Photo courtesy of Liz Russell/CMNH.

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Collection of the skull of the new horned dinosaur, Albertaceratops nesmoi, from the Pinhorn Grazing Reserve of southern Alberta, Canada. Pictured from left to right are Don Brinkman, Heather Jamniczky, and Brian Matthews. Courtesy of Michael. J Ryan.

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Dr.  Michael J. Ryan with the holotype skull of the new horned dinosaur, Albertaceratops nesmoi, from southern Alberta, Canada. Photo courtesy of Chad Kerychuk, Digital Dream Machine.