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  1. Predicting the susceptibility of Illinois forest stands to defoliation by the gypsy moth / David L. Swofford, Michael R. Jeffords, and Karen W. O'Hayer.
    By: Swofford, David L. - Jeffords, Michael R. - O'Hayer, Karen W. - Illinois.
    Publication info: Champaign, Ill. :Illinois Natural History Survey,[1988]
    Contributed by: University of Illinois Urbana Champaign
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