Geis, A. D. 1974. Breeding and wintering areas of Canvasbacks harvested in 

 various states and provinces. U.S. Fish & Wildl. Serv., Spec. Sci. 

 Rept. Wildl. No. 185. iv and 78 pp. 



Perry, M. C. 1974. Looking out for the Canvasback. Part IV. Ducks Unlimited 

 38: 21-22, 25-27. 



Trauger, D. L. 1974. Looking out for the Canvasback. Part I. Ducks Unlimited 

 38: 12-15. 



Trauger, D. L. and J. H. Stoudt. 1974. Looking out for the Canvasback. Part 

 II. Ducks Unlimited 38: 30-31, 42, 44-45, 48, 60. 



1973 



Anon. 1973. Color-coded Canvasbacks. Atl. Nat. 29: 4. 



Bergman, R. D. 1973. Use of southern boreal lakes by postbreeding Canvasbacks 

 and Redheads. J. Wildl. Manage. 37: 160-170. 



Mattson, M. E. 1973. Host-parasite relations of Canvasback and Redhead duck- 

 lings. M.S. thesis, Utah State Univ. /Logan, UT. 62 pp. 



Trauger, D. L. 1973. Project report: special Canvasback project, 1973. North- 

 ern Prairie Wildl. Res. Cntr., Jamestown, ND. 3 pp. 



1972 



Slatick, E. R. 1972. A look at ducks. Penna. Game News 43: 24-27. 



1971 



Nieman, D. J. 1971. Breeding biology and habitat relationships of Mallard and 

 Canvasbacks in the Peace-Athabaska Delta. M.S. thesis, Univ. Saskatchewan/ 

 Saskatoon, SK. 78 pp. 



1970 



Kocan, R. M. and J. 0. Knisley. 1970. Incidence of malaria in a wintering 

 population of Canvasbacks ( Aythya valisineria ) in Chesapeake Bay. J. 

 Wildl. Dis. 6: 441-442. 



1969 



Bartonek, J. C. 1969. Build-up of grit in three pochard species in Manitoba. 

 Wilson Bull. 81: 96-97. 



Bartonek, J. C. and J. J. Hickey. 1969a. Food habits of Canvasbacks, Redheads, 

 and Lesser Scaup in Manitoba. Condor 71: 280-290. 



266 



