Parks, Catherine G. Field guide for the identification of snags and logs in the interior Columbia River basin / Catherine G. Parks, Evelyn L. Bull, Torolf R. Torgersen. -- Portland : USDA Forest Service, 1997. -- 40 s. : 72 obr. ; 22 cm. -- (General Technical Report ; PNW-GTR-390). -- (brož.) : .00

I. Bull, Evelyn L.
II. Torgersen, Torolf R.

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