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Osteohistology of Edmontosaurus annectens femora 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 67602). (c, d) Late juvenile (ROM 67798). (e, f) Early subadult (ROM 67799). (g, h) Early adult (ROM 67792). Scale bars are 0.5 cm. L, laminar; MC, medullary cavity; P, plexiform; R, reticular
