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  1. By: Cooper, Stephen V. - Heidel, Bonnie L. - Blackfeet Tribe of the Blackfeet Indian Reservation of Montana. Blackfeet Fish and Wildlife Department. - U.S. Fish and Wildlife Service - Montana Natural Heritage Program.
    Publication info: Helena, Mont, Montana Natural Heritage Program, c1997
    Holding Institution: Montana State Library
    Subjects: Black cottonwood  Blackfeet Indian Reservation  Montana  Plants  Population  Populus tremuloides  
  2. By: Haack, Paul M. - Northern Forest Experiment Station (Juneau, Alaska)
    Publication info: Juneau, Alaska, Northern Forest Experiment Station, 1963
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
    Subjects: Alaska  Alaska paper birch  Black cottonwood  Forests and forestry  Measurement  Populus tremuloides  White spruce