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  1. By: Ruggieri, George D. - Nigrelli, Ross F. (Ross Franco),
    Type: Article
    In: Zoologica : scientific contributions of the New York Zoological Society.
    Volume: 45
    Issue: 1
    Date: 1960
    Page Range: 1--16
    Publication Info: New York.
  2. By: Nigrelli, Ross F. (Ross Franco), - Ruggieri, George D.
    Type: Article
    In: Zoologica : scientific contributions of the New York Zoological Society.
    Volume: 51
    Issue: 9
    Date: 1966
    Page Range: 97--102
    Publication Info: New York.
  3. By: Ruggieri, George D. - Nigrelli, Ross F. (Ross Franco), - Powles, P. M.
    Type: Article
    In: Zoologica : scientific contributions of the New York Zoological Society.
    Volume: 55
    Issue: 4
    Date: 1970
    Page Range: 57--72
    Publication Info: New York.
  4. By: Ruggieri, George D.
    Type: Article
    In: Bollettino malacologico
    Volume: 23
    Date: 1987
    Page Range: 413--416
    Publication Info: Milano :Unione malacologica italiana
  5. By: Nigrelli, Ross F. (Ross Franco), - Ketchen, K S - Ruggieri, George D.
    Type: Article
    In: Zoologica : scientific contributions of the New York Zoological Society.
    Volume: 50
    Issue: 11
    Date: 1965
    Page Range: 115--122
    Publication Info: New York.
  6. By: Nigrelli, Ross F. (Ross Franco), - Ruggieri, George D.
    Type: Article
    In: Zoologica : scientific contributions of the New York Zoological Society.
    Volume: 50
    Issue: 9
    Date: 1965
    Page Range: 83--96
    Publication Info: New York.