White, D. H. , R. C. Stendall and B. M. Mulhern. 1979. Relations of wintering 

 Canvasbacks to environmental pollutants — Chesapeake Bay, Maryland. Wilson 

 Bull. 91: 279-287. 



1978 



Dieter, M. P. 1978. Use of the ALAD blood enzyme bioassay to monitor lead 



contamination in the Canvasback population. Proc . Internatl. Symp. Patho- 

 biol. Environ. Poll. C-227-C-229. 



Sugden, L. G. 1978. Canvasback habitat use and production in Saskatchewan 

 parklands. Can. Wildl. Serv. Occas. Pap. No. 34. 32 pp. 



1977 



Stendell, R. C. , E. Cromartie, S. N. Wiemeyer and J. R. Longcore. 1977. Organ- 

 ochlorine and mercury residues in Canvasback Duck eggs, 1972-73. J. Wildl. 

 Manage. 41: 453-457. 



1976 



Dieter, M. P., M. C. Perry and B. M. Mulhern. 1976. Lead and PCB's in Canvas- 

 back Ducks: relationships between enzyme levels and residues in blood. 

 Arch. Environ. Contain. Toxicol. 5: 1-13. 



Enders, F. A. 1976. Where do New York City Canvasbacks feed? Linn. Newsl. 

 30: 1. 



Kocan, R. M. and M. C. Perry. 1976. Infection and mortality in captive wild- 

 trapped Canvasback Ducks. J. Wildl. Dis. 12: 30-33. 



Kocan, R. M. and S. M. Pitts. 1976. Blood values of the Canvasback by age, 

 sex and season. J. Wildl. Dis. 12: 341-346. 



Siegfried, W. R. 1976b. Segregation in feeding behaviour of four diving 

 ducks in southern Manitoba. Can. J. Zool. 54: 730-736. 



Sugden, L. G. 1976. Experimental release of Canvasbacks on breeding habitat. 

 J. Wildl. Manage. 40: 716-720. 



1975 



Featherstone , J. D. 1975. Aspects of nest site selection in three species of 

 ducks. Ph.D. thesis, Univ. Toronto/Toronto, ON. 



Kovacs, S. 1975. An entangled Canvasback. Jack-Pine Warbler 53: 159-160. 



1974 



Anon. 1974. Canvasbacks marked in migration study. Atl. Nat. 29: 149. 



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