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Academy of Sciences Agricultural Experiment Station American Naturalist Aquatic Ecology Baird Beneficial Insects Biennial Report biological station Charles Chicago Chinch-Bug copepods Crop Report Circular Crustacea Department of Registration ecologists Economic Entomology Entomologist Entomologist's Office Entomostraca fauna Fisheries Fishes of Illinois Food of Young Forbes and Robert Forbes File Forbes's Fresh-water History Survey Archives History Survey Division Horticultural Society Ibid Illinois Crop Report Illinois Farmers Illinois State Entomologist's Illinois State Horticultural Illinois State Laboratory Incorporated in Report interactions Journal Kofoid Laboratory of Natural Lake Mendota Lake Michigan lllinois Archives lllinois Fishes lllinois Natural History Methods Microcosm Museum Natural History Survey Noxious and Beneficial organisms Plankton Plankton Studies quantitative quotation R. E. Richardson Registration and Education Report of S. A. S. A. Forbes San Jose Scale scientific Shelford species Stephen Alfred Forbes Stephen Forbes Transactions United States Fish University of Illinois Urbana Volume whitefish Wisconsin Zoology zooplankton