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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Blackman, M. W. (Maulsby Willett), - Maine Agricultural Experiment Station. - Maine. Forest Commissioner. - University of Maine Forestry Department.
    Publication info: Maine, 1919
    Holding Institution: University of California Libraries
    Subjects: Spruce bud-worm  
  2. By: Swaine, J. M. (James Malcolm), - Swaine, J. M. (James Malcolm), - Bailey, Irving W. (Irving Widmer),
    Publication info: Ottawa [King's Printer] 1924
    Holding Institution: Agriculture and Agri-Food Canada (AAFC)
    Subjects: Diseases and pests  Spruce  Spruce bud-worm