Whitehead, Roger J. A comparison of four treatments for weeding Engelmann spruce plantations in the Interior Cedar Hemlock Zone of British Columbia : ten years after treatment / Roger J. Whitehead, George James Harper. -- Victoria : Canadian Forest Service, 1998. -- vi, 21 s. : 16 obr., 8 tab. ; 27 cm. -- (Information report ; BC-X-379). -- ISBN 0-662-26608-0 (brož.) : 90.00 Sk. -- ISSN 0830-0453

I. Harper, George James, 1959-

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