Andersen, Stig Using opportunity costs to assess the economic impact of spruce budworm defoliation / Stig Andersen, John M. Lawson, Derek F. Dool. -- Sault Ste. Marie : Canadian Forest Service, 1995. -- 1 dvojlist : 3 obr., fot. ; 28 cm. -- (Frontline ; No. 19). -- ISBN 0-662-23425-1 : 20.00 Sk

I. Lawson, John M.
II. Dool, Derek F.

630*145.7+630*453+614.449+630*453+657.47
ZV001