LITERATURE CITED 



American Ornithologists' Union. 1983. Check-list of North 



American birds, 6th edition. Allen Press, Lawrence, Kans. 877 



PP.v. 



Ashley, J. 1992. A summary of documented harlequin duck 

 observations in Glacier National Park, 1874-1992. Unpubl. 

 Report, Glacier Natl. Park, West Glacier, Mont. 19 pp. 



Bellrose, F.C. 1976. Ducks, geese and swans of North America. 

 Stackpole Books, Harrisburg, Penn. 540 pp. 



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

 Iceland. Wildfowl Trust Ann. Rep. 17:79-94. 



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



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



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. 



Carlson, J.C. 1990. Results of harlequin duck ( Histrionicus 



h istrionicus ) surveys in 1990 on the Flathead National forest, 

 Montana. Mont. Nat. Heritage Prog., Helena. 32 pp. 



Cassirer, E.F. and C.R. Groves. 1989. Breeding ecology of 

 harlequin ducks ( Histrionicus histrionicus ) on the Kaniksu 

 National Forest, Idaho. Idaho Dept. Fish Game, Nongame 

 Endangered Wildl. Prog. 48 pp. 



Cassirer, E.F. and C.R. Groves. 1990. Distribution, habitat use, 

 and status of harlequin ducks in northern Idaho, 1990. Idaho 

 Dept. Fish Game, Nongame Endangered Wildl. Prog. 54 pp. 



Cassirer, E.F. and C.R. Groves. 1991. Harlequin duck ecology in 

 Idaho: 1987-1990. Idaho Dept. Fish Game, Nongame Endangered 

 Wildl. Prog. 93 pp. 



Clarkson, P. 1992. A preliminary investigation into the status 

 and distribution of harlequin ducks in Jasper National Park. 

 Unpubl. Tech. Rep. Heritage Resource Conservation, Jasper 

 National Park. 65 pp. 



Diamond, S. and P. Finnegan. 1992. Harlequin duck ecology on 



Montana's Rocky Mountain Front. USDA, Lewis and Clark Natl. « 

 For., Rocky Mountain Ranger Dist. , Choteau, MT. 45 pp. 



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

 Sound, Alaska during summer. Unpubl. M.S. Thesis, Ore. State 

 Univ., Corvallis. 89 pp. 



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