Simpson, Ralph Arnold, 1953- An ecological atlas of forest insect defoliation in Canada 1980-1996 / Ralph Arnold Simpson, Dana Coy. -- Fredericton : Canadian Forest Service, 1999. -- 15 s. : far. obr., mp. ; 28 cm. -- (Information report ; M-X-206E). -- ISBN 0-662-28299-X (brož.) : .00. -- ISSN 1195-3799

I. Coy, Dana

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