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  1. By: Gregory, R. A. (Robert Aaron) - Haack, Paul M. - Northern Forest Experiment Station (Juneau, Alaska)
    Publication info: Juneau, Alaska, Northern Forest Experiment Station, [1964]
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: Zasada, John C. - Gregory, R. A. (Robert Aaron) - Institute of Northern Forestry (U.S.)
    Publication info: Juneau, Alaska, Pacific Northwest Forest and Range Experiment Station, Institute of Northern Forestry, U.S. Dept. of Agriculture, 1969
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library