REFERENCES 

 Bellrose, F.C. 1976. Ducks, Geese and Swans of North America. 



Stackpole Books, Harrisburg, PA. 540 pp. 

 Bengston, S.A. 1966. Field studies on the harlequin duck in 



Iceland. Wildfowl Trust Annual Report. 17:79-94 

 Bengston, S.A. and S.Ulf strand 1971. Food resources and breeding 

 frequency of the harlequin duck, Histrionicus 

 histrionicus , in Iceland. Oikos 22:235-239 

 Bengston, S.A. 1972. Breeding ecology of the harlequin duck, 



Histrionicus histrionicus . in Iceland. Ornis Scand. 3:1-19 

 Cassier, E.F. 1989. Distribution and status of harlequin ducks 



( Histrionicus histrionicus ) on the Nez Perce National Forest 

 in Idaho. Idaho Department of Fish & Game, Boise ID. 13 pp. 

 Cottam, C. 1939. Food habits of North American diving ducks. 

 U.S. Dept. of Agric. Tech. Bull. 643. 140pp. 

 Dzinbal, K.A. 1982. Ecology of harlequin ducks in Prince 



William Sound, Alaska during summer. M.S. Thesis, Oregon 

 State University, Corvallis. 89 pp. 

 Gollop,J.B. and W.H. Marshall 1954. A guide to aging duck broods 

 in the field. Miss. Flyway Council Tech. Sect. Report. 9 pp. 

 Kuchel, C.R. 1977. Some aspects of the behavior and ecology of 



harlequin ducks breeding in Glacier National Park, Montana. 

 M.S. Thesis, University of Montana, Missoula. 147 pp. 

 Miller, V.E. 1988. Harlequin ducks ( Histrionicus histrionicus ) 

 1988 results of field surveys in west-central Montana. 

 Unpublished Report. 13 pp. 



27 



