^ 



i\S Biota of Freshwater Ecosystems 



Identification Manual No. 7 



FRESHWATER ISOPODS (ASELLIDAE) OF NORTH AMERICA _ 



MARINE 

 BiOl-CGlCAL 

 LABORATORY 



LIBRARY 



by i~~  — 1 



vVGQOS HOLE, fMSS. | 



W. D. Williams f V^. H. 0. L \ 



Department of Zoology, Monash University ' 



Clayton, Victoria 3168 

 Australia 



for the 



ENVIRONMENTAL PROTECTION AGENCY 



Project # 18050 ELD 

 Contract # 14-12-894 



May 1972 



For sale by the Superintendent of Documents, U.S. Government Printing Office 



Washington, D.C. 20402  Price $2.50 



Stock Number 5501-0390 



