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  1. By: Heckenberger, Michael J. - Petersen, James B. - Basa, Louise A.
    Type: Article
    In: Annals of the Carnegie Museum
    Volume: 59
    Issue: 3
    Date: 1990-09-05
    Page Range: 173--217
    Publication Info: [Pittsburgh], Published by authority of the Board of Trustees of the Carnegie Institute, 1901-