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  1. 1

    Pagputol ng puno sa Vinzons, pruning lang daw 由 De Castro, Diwata

    發表在 Philippine Collegian (1994)
    Article

    Pagputol ng puno sa Vinzons, pruning lang daw
  2. 2

    Illegal logging sa U.P.

    發表在 Philippine Collegian (1992)
    Article

    Illegal logging sa U.P.
  3. 3

    Timber cutting practices 由 Conway, Steve

    出版 1978
    圖書

    Timber cutting practices

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