Psocids, annoying house pests ...
Back, E. A. 1886-
Psocids, annoying house pests ... - [Washington, U.S. Govt. Print. Off., 1939] - 4 p. 1 illus. 23 cm. - U.S. Dept. of agriculture. Leaflet no. 189 .
"By E.A. Back."--p. 2. Contribution from Bureau of entomology and plant quarantine.
agr39000749
Psocidae.
QL513.P9 / B28
Psocids, annoying house pests ... - [Washington, U.S. Govt. Print. Off., 1939] - 4 p. 1 illus. 23 cm. - U.S. Dept. of agriculture. Leaflet no. 189 .
"By E.A. Back."--p. 2. Contribution from Bureau of entomology and plant quarantine.
agr39000749
Psocidae.
QL513.P9 / B28