Predators of the douglas-fir beetle in Western Oregon
Cowan, B.D., Nagel, W.P.
Predators of the douglas-fir beetle in Western Oregon - Corvallis 1965 - 32 p. - No. 86; Oregon Agricultural Ex .
Predators of the douglas-fir beetle in Western Oregon - Corvallis 1965 - 32 p. - No. 86; Oregon Agricultural Ex .