Larch Sawfly Epidemic in the Lake States: Surveys and Spraying Experiments in 1949 and 1950 by United States Bureau of Entomology and Plant Quarantine, U.S. Department of Agriculture (1952)

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Larch Sawfly Epidemic in the Lake States: Surveys and Spraying Experiments in 1949 and 1950 United States Bureau of Entomology and Plant Quarantine, U.S. Department of Agriculture (1952)