UNITED STATES DEPARTMENT OF THE INTERIOR, STEWART L. UDALL, SECRETARY 

 Fish and Wildlife Service, Clarence F. Pautzke, Commissioner 

 Bureau of Sport Fisheries and Wildlife, Daniel H. Janzen, Director 



PUBLICATIONS ON FISH PARASITES AND DISEASES, 330 B. C. - A. D. 1923 



By 



E. A. McGregor 



Special Scientific Report- -Fisheries No. 474 



Washington, D. C. 

 1963 



