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Pocket guide to christmas tree diseases / Thomas H. Nicholls and Robert D. Wray.

by Nicholls, Thomas H.
[St. Paul, MN] : [Washington, D.C. : U.S. Dept. of Agriculture, Forest Service, North Central Forest Experiment Station ; For sale by the Supt. of Docs., U.S. G.P.O., 1989].

Biology and conservation of owls of the Northern Hemisphere : second international symposium, February 5-9, 1997, Winnipeg, Manitoba, Canada / editors James R. Duncan, David H. Joh...

St. Paul, Minn. : North Central Research Station, Forest Service, U.S. Dept. of Agriculture, 1997.

Series: General technical report NC ; 190.

Other Authors: '; “...Nicholls, Thomas H....”

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