Kellogg, Loren D. Tractor thinning productivity and costs : experience from the Willamette Young Stand Project / Loren D. Kellogg, Chad T. Davis. -- Corvallis : Oregon State University, 2006. -- 32 s. : obr., tab., graf., 1 príl. ; 28 cm. -- (Research Contribution ; 48). -- (brož.)

I. Davis, Chad T.

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