The Corn Leaf-Aphis and Corn Root-Aphis / F. M. Webster.
doi 10.5962/bhl.title.63517
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Date
January 1, 1907
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U.S. Dept. of Agriculture, Bureau of Entomology,
Available in full text
January 1, 1907
U.S. Dept. of Agriculture, Bureau of Entomology,