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    0501 Ecological Applications (1)
    050103 Invasive Species Ecology (1)
    0503 Soil Sciences (1)
    050303 Soil Biology (1)
    0602 Ecology (1)
    0603 Evolutionary Biology (1)
    0705 Forestry Sciences (1)
    biological invasion (1)
    Douglas-fir (1)
    Ecology (1)