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  1. By: Ritzenthaler, Robert Eugene,
    Publication info: Milwaukee, Wis, Published by order of the Board of Trustees, 1953
    Holding Institution: University of Toronto - Robarts Library
  2. By: Ritzenthaler, Robert Eugene, - Quimby, George Irving,
    Publication info: [Chicago], Chicago Natural History Museum, 1962
    Holding Institution: Field Museum of Natural History Library