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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Martignoni, Mauro E., - Iwai, Paul J. - Pacific Northwest Forest and Range Experiment Station (Portland, Or.) - Canada/United States Spruce Budworms Program.
    Publication info: Portland, Or, Pacific Northwest Forest and Range Experiment Station, U.S. Dept. of Agriculture, Forest Service, 1981
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library