Two orchard scale insects
Ross, W.A.
Two orchard scale insects The san jose scale and the oyster-shell scale - Ottawa 1925 - 1-4 p. - Orchard, Insect Canada Department of Agriculture. Circular No. 37 .
Two orchard scale insects The san jose scale and the oyster-shell scale - Ottawa 1925 - 1-4 p. - Orchard, Insect Canada Department of Agriculture. Circular No. 37 .