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Cranial variation in Gryposaurus and biostratigraphy of hadrosaurines (Ornithischia: Hadrosauridae) from the Dinosaur Park Formation of Alberta, Canada
The motor nuclei and roots have already been studied and reconstruction charts have been made in the following anuran amphibians: Rana esculenta (Kappers, 35); Rana fusca and Bufo sp.?(Röthig, 50). These charts are reproduced in the present paper in figure 9, p. 395.