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Osteohistology of Edmontosaurus annectens humeri from the Ruth Mason dinosaur quarry of South Dakota, United States under plain‐polarized (PP) and cross‐polarized (XP) light microscopy. (a, b) Late juvenile (ROM 73849). (c, d) Early subadult (ROM 67796). (e, f) Late subadult (ROM 73850). (g, h) Late adult (ROM 67794). Scale bars are 0.5 cm. (l), laminar; MC, medullary cavity; (p), plexiform; R, reticular
