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  1. Oxford American Dictionary

    Peterson, Roger Tory

    • IPA[ˈpēdərsən]

    美式

    • ph.
      (1908–96), US ornithologist and artist. Peterson produced his first book for identifying birds in the field in 1934, introducing the concept of illustrating similar birds in similar postures with their differences highlighted. The format of his work has become the standard in field guides.