Growing healthy seedlings :
identification and management of pests in Northwest forest nurseries /
Philip B. Hamm, Sally J. Campbell, Everett M. Hansen, editors.

APA Citation

Hansen, E. M., Campbell, S. J., Hamm, P. B., United States. Forest Pest Management. (1990). Growing healthy seedlings: identification and management of pests in Northwest forest nurseries. [Portland, OR]: Forest Pest Management, U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Region .

MLA Citation

Hansen, Everett M, Sally J Campbell, Philip B Hamm, and United States. Forest Pest Management. Growing Healthy Seedlings: Identification And Management of Pests In Northwest Forest Nurseries. [Portland, OR]: Forest Pest Management, U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Region , 1990.