Graham, S.A. 1929 . Principles of Forest Entomology. Mc-Graw Hill New York 339 pp.
Notes: Scales reviewed includes oyster shell scale, cottony maple scale and European elm scale (Gossyparia spuria).
Graham, S.A. 1929 . Principles of Forest Entomology. Mc-Graw Hill New York 339 pp.
Notes: Scales reviewed includes oyster shell scale, cottony maple scale and European elm scale (Gossyparia spuria).