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Ground Cornstalks and Cobs As Base Materials and Magnesium Sulphate and Sodium Fluosilicate As Poisons in Grasshopper Baits

出版	University of Nebraska, College of Agriculture, Experiment Station, 1937
URL	http://books.google.com.hk/books?id=Vh0zzgEACAAJ&hl=&source=gbs_api