Back, E. A.  1886- <br/><br/>
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 .
<br/><br/> "By E.A. Back."--p. 2.  Contribution from Bureau of entomology and plant quarantine. 
<br/><br/><label>LCCN: </label>agr39000749  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Psocidae.
<br/><br/><label>LC Class. No.: </label>QL513.P9  / B28