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Plant Pests Of Importance To North American Agriculture
1 . http://naldc.nal.usda.gov/download/CAT87209128/PDF
Washington, D.C. : Crops Research Division, Agricultural Research Service, U.S. Department of Agriculture, 1960.
Internet File
2 . http://naldc.nal.usda.gov/download/CAT87209111/PDF
Thornberry, Halbert Houston, 1902-
Washington, D.C. : Agricultural Research Service, U.S. Department of Agriculture, 1966.
Internet File
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