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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Davis, D. W. - Nichols, M P - Armbrust, Edward J.,
    Publication info: Urbana, Illinois Dept. of Registration and Education, Natural History Survey Division, 1974
    Holding Institution: University Library, University of Illinois Urbana Champaign
  2. By: Nichols, M P
    Publication info: Urbana, Illinois Dept. of Registration and Education, Natural History Survey Division, 1974
    Holding Institution: University Library, University of Illinois Urbana Champaign