Pakulak, A. S. and D. L. Littlef ield . 1968 ms. Breeding status of Whistling 

 Swans in northern Manitoba. Manitoba Dept. Mines, Resourc, Environ. 

 Manage. 



1966 



Scott, P. 1966. The Bewick's Swan at Slimbridge. Wildfowl Trust Annu. Rept. 

 17: 20-26. 



Tate, D. J. R. 1966. Morphoraetric age and sex variation in the Whistling 

 Swan, Olor columbianus . M.S. thesis, Univ. Nebraska/Lincoln, NE. 



1965 



Bartonek, J. C. 1965. Some summer and migration observations on Whistling 

 Swans in Manitoba. Can. Field-Nat. 79: 217-218. 



Nagel, J. 1965. Field feeding of Whistling Swans in northern Utah. Condor 

 67: 446-447. 



Post, W., Jr. 1965. Whistling Swan at Barnwell, South Carolina. Chat 29: 52, 



Trainer, P. 0. and R. A. Hunt. 1965. Lead poisoning of Whistling Swans in 

 Wisconsin. Avian Dis. 9: 252-263. 



1963 



Geroudet, P. 1963. Retour des Cygnes de Bewick sur Le Leman. Nos Oiseaux 

 27: 181-182. 



Sermet, E. 1963. Des Cygnes de Bewick a Yverdon. Nos Oiseaux 27: 181. 



1962 



Geroudet, P. 1962. L'hivernage des Cygnus bewicki sur Le Leman Savoyard. 

 Nos Oiseaux 26: 317-319. 



1960 



Nero, R. W. 1960. A record of flight altitude of Whistling Swans. Blue Jay 

 18: 159. 



Sherwood, G. A. 1960. The Whistling Swan in the west with particular refer- 

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1959 



Sherwood, G. A. 1959. The Whistling Swan in the Great Salt Lake Valley of 

 Utah. M.S. thesis, Utah St. Univ. /Logan, UT. 79 pp. 



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