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  1. 1
    Some observations on age relationships in spruce-fir regeneration /
    by Blum, Barton M
    Published 1973

    Government Document Book
  2. 2
    Stump sprouting of four northern hardwoods /
    by Solomon, Dale S
    Published 1967

    Government Document Book
  3. 3
    Vacuum pumping increases sap yields from sugar maple trees /
    by Blum, Barton M, Blum, Barton M
    Published 1968

    Government Document Book
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