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  1. By: Koel, Todd Marvin. - Sparks, Richard E. - Illinois. Natural History Survey Division
    Publication info: Havana, Ill, Illinois Natural History Survey, LTRMP Havana Field Station, [1999]
    Holding Institution: Lewis & Clark Community College / NGRREC
  2. By: Koel, Todd Marvin. - Illinois. Dept. of Natural Resources. - Illinois. LTRMP Havana Field Station. - Illinois. Natural History Survey Division. LTRMP Havana Field Station.
    Publication info: Havana, Ill, Illinois Natural History Survey, Illinois River Biological Station, 1997
    Holding Institution: Lewis & Clark Community College / NGRREC
  1. By: Koel, Todd Marvin. - Peterka, John J.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 112
    Issue: 4
    Date: 1998
    Page Range: 631--646
    Publication Info: Ottawa Ottawa Field-Naturalists' Club