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  1. 1
    The effect of various seedbed treatments on the germination and survival of white spruce and lodgepole pine seedlings
    by Ackerman, R. F
    Published 1957

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  2. 2
    Continuous planting of white spruce throughout the frost-free period,
    by Ackerman, R. F
    Published 1962

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  3. 3
    Density prediction in lodgepole pine stands by diameter growth analysis,
    by Ackerman, R. F
    Published 1962

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