CIRCULAR 13 



Fish and Wildlife Service, Albert M. Day, Director 

 United States Department of the Interior, J. A. Krug, Secretary 



UNITED STATES GOVERNMENT PRINTING OFFICE 



1 948 



For sale by the Superiiilendcnt of Documents, U. S. Governnieut rrintiinf Otiice 

 Wiishiiijiton 25, D. C. - Price 5 cents 



