Enverionmental reuirements and pollution tolerence of trichoptra 

 - Washington :  U.S. Government Printing Office,  1978 
 - verious pagings :  ill. ;  29 cm. 
<br/><br/> EPA-600/4-78-063 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Pollution<br/>Environmental pollution
<br/><br/><label>Dewey Class. No.: </label>363.73