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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Prior, Sophia. - Frey, Albert
    Publication info: Chicago, Field Museum of Natural History, 1939
    Holding Institution: University Library, University of Illinois Urbana Champaign
  2. By: Dahlgren, B. E. (Bror Eric), - Frey, Albert
    Publication info: [Chicago], Chicago Natural History Museum, 1947
    Holding Institution: Field Museum of Natural History Library