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  1. By: Alexander, Robert R. - Shearer, R.C. - Shepperd, W.D.
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
    Subjects: Abies lasiocarpa  Ecological succession  Geographical distribution  Habitats  life cycle (organisms)  North America  Plant communities  
  2. By: Ferrell, George T.
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
    Subjects: California  conifer needles  discoloration  Epidemiology  Hemiptera  Insect pests  life cycle (organisms)  North America  Nuculaspis californica  Pest Control  Pinopsida  Pinus  
  3. By: Ferrell, George T.
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
    Subjects: Abies concolor  Abies grandis  Abies magnifica  Animal behavior  Geographical distribution  Insect Control  life cycle (organisms)  natural enemies  Scolytus ventralis  symptoms  Western United States  
  4. By: United States. Department of Agriculture.
    Publication info: [Washington, D.C.], U.S. Dept. of Agriculture, 1991
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
    Subjects: Biological control  Hypera postica  life cycle (organisms)  Medicago sativa  Microctonus  Parasites  United States  
  5. By: Cavey, Joseph F. - Passoa, S
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
    Subjects: Disease Vectors  forest pests  Insect pests  Ips typographus  life cycle (organisms)  Pennsylvania