Becker, W. B. 1937a. A review of the insect pests of elm, with a detailed study of biology of the native elm bark beetle, Hylurgopinus ruflpes Eich. Unpublished thesis, Massachusetts State College, Amherst. 56 p., 3 charts, 2 figs.
Becker 1937
Funded by the National Science Foundation PEET program (Partnerships for Enhancing Expertise in Taxonomy)
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