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  1. Classification of the forest vegetation of Colorado by habitat type and community type.
    By: Alexander, R.R.
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
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  2. Classification of the forest vegetation of Wyoming.
    By: Alexander, R.R.
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
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  3. Silvical characteristics of subalpine fir.
    By: Alexander, R.R. - Shearer, R.C. - Shepperd, W.D.
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
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