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  1. 1

    Synopsis of animal classification by Clark, R. B. (Robert Bernard), 1923-

    Published 1971
    Book
  2. 2

    Principles of systematic zoology by Mayr, Ernst, 1904-

    Published 1969
    Book
  3. 3
  4. 4

    Essay on classification by Agassiz, Louis, 1807-1873

    Published 1962
    Book
  5. 5

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