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  1. By: Smith, James Perrin,
    Publication info: Palo Alto, Cal, 1900
    Holding Institution: University Library, University of Illinois Urbana Champaign
    Subjects: Placenticeras  
  2. By: Kennedy, W. J. (William James) - Cobban, William Aubrey, - Landman, Neil H.
    Publication info: New York, N.Y, American Museum of Natural History, c1996
    Holding Institution: American Museum of Natural History Library
    Subjects: Ammonoidea  Cretaceous  Paleontology  Placenticeras  West (U.S.)