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  1. By: Dix, M.E. - Tagestad, A. D. - Stein, John D. - Jacobson, Martin
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
    Subjects: forest trees  Illinois  Insect pests  Insect traps  Kansas  Western United States  
  2. 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  
  3. By: Schwarz, Eugene Amandus,
    Publication info: 1898
    Holding Institution: Smithsonian Institution Archives
    Subjects: Arizona  Entomology  Field notes  Insects--Arizona  Insects--Texas  National Museum of Natural History (U.S.)  National Museum of Natural History (U.S.) Dept. of  Schwarz, Eugene Amandus, 1844-1924  Texas  Western United States  
    BHL Collections: Smithsonian Field Books collection
  1. By: Hershler, Robert - Liu, Hsiu-Ping. - Simpson, Jeffrey
    Type: Article
    In: ZooKeys
    Volume: 492
    Date: 2015
    Page Range: 107-122
    Publication Info: Pensoft Publishers 2015
    Subjects: aquatic snails  Assimineidae  Biogeography  Conservation  Gastropoda  Hydrobiidae  taxonomy  Western United States  
  2. By: Johnson, Leigh A - Gowen, David
    Type: Article
    In: PhytoKeys
    Volume: 91
    Date: 2017
    Page Range: 39-83
    Publication Info: Pensoft Publishers 2017
    Subjects: Allopolyploidy  California  conservation assessment  exclusivity  species delimitation  taxonomy  unified species concept  Western United States
  3. By: Liu, Hsiu-Ping. - Hershler, Robert - Rossel, Chris
    Type: Article
    In: ZooKeys
    Volume: 514
    Date: 2015
    Page Range: 1-13
    Publication Info: Pensoft Publishers 2015
    Subjects: aquatic  Conservation  Gastropoda  Phylogeny  systematics  Western United States