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