1930. Recent progress in duck disease studies, 
Journal American Veterinary Medical Association, New ser. 
30(5) 2561-568. 
Sperry, Charles C. 
1927. Report on the “duck sickness" in southern Oregon and northern 
California, summer of 1927. 
U. S. Dept. of the Interior 
Fish and Wildlife Service files, typed rept. 
1947. Botulism control by water manipulation. 
12th North American Wildlife Conference Transactions: 228-233. 
Twomey, Arthur C. and Sarah J. Twomey 
1936. Selenium and duck sickness. 
Science 83:(2159) 270-71. 
Twomey, Arthur C., Sarah J. Twomey, and Loring R. Williams 
1939. Selenium and duck sickness 
Science 90:(23)6):572-573. ° 
Wetmore, Alexander 
1918. The duck sickness in Utah. 
U. S. Department of Agriculture Bulletin 672. 
"Williams, Cecil S. ; 
190. Progress report, july, —" sastaition, 19,0. 
Bear River Migratory Waterfowl Refuge, Brigham City, Utah. 
U.-S. Dept. of the Interior 
Fish and Wildlife Service files, typed rept. 
Willians, Cecil S. and G. Hortin Jensen 
1943. Quarterly report, January-March 19h3. 
U. S. Dept. of the Interior 
Fish and Wildlife Service rept. 
52051 

