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  1. Beneficial insects and mites /
    By: Henn, Tess. - Weinzierl, Rick. - Illinois. - University of Illinois at Urbana-Champaign.
    Publication info: Urbana, Ill. :Office of Agricultural Entomology, University of Illinois at Urbana-Champaign, College of Agriculture, Cooperative Extension Service, in cooperation with the Illinois Natural History Survey,[1990].
    Contributed by: University of Illinois Urbana Champaign
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  2. Field and forge crops /
    By: Henn, Tess. - Illinois. - University of Illinois at Urbana-Champaign.
    Publication info: Urbana, Ill. :University of Illinois at Urbana-Champaign, College of Agriculture, Illinois Cooperative Extension,[1991].
    Contributed by: University of Illinois Urbana Champaign
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