Canadian Forest Service Publications
Adelges piceae (Ratz.) in Canada with reference to biological control. 1958. Balch, R.E.; Clark, R.C.; Brown, N.R. Pages 807-817 (Vol. 4) in Proceedings: 10th Int'l Congress of Entomol. August 17-25, 1956, Montreal, Que.
Available from: Atlantic Forestry Centre
Catalog ID: 8440