16 
XII. LITERATURE CITED 
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American Wildl. Conf., pp. 9-98. 
o--------- - 1938. The blue-winged teal, its ecology and management. Collegiate 
Press, Ames, Iowa. 
Benson, H. D. 1948. Basic factors in the productivity of waterfowl on three 
prairie ponds in 1947. Master's Thesis, University of Minn. 
Bird, R. H. 1930. Biotic communities of the aspen parkland of central Canada. 
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Crissey from p 133 
Currie, PR. W. 1948. The vegetative and frost-free seasons of the prairie provinces 
and northwest territories. Can. Jour. Res. 26(c): 1-1). 
Ellis, J. H. 1938. The soils of Manitoba. Manitoba Economic Survey Board, Winnipeg. 
Bvans, C. D. 1951. <A method of color marking young waterfowl. Jour. Wildlife Met. 
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Farrington, S. K. 1945. The ducks came back. Coward-McCann, Inc. N. Y. 
Furniss, 0. C. 1935. The duck situation in the Prince Albert district, central 
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Hochbaum, H. A. 194). The canvasback on a prairie marsh. The American “ildlife 
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Leopold, Aldo. 1933. Game management. Charles Scribner's Sons, New York. 
Low, J. B. 1940. Production of the redhead, Nyroca americana, in Iowa. Wilson 
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wo asaen ne » 1945. Ecology and management of the redhead, Nyroca americana in 
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Metcalf, Franklin. 1931. Wild-duck foods of North Dakota lakes. U. 5S. D. A. 
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Moyle, J. B. 1945. ‘Some chemical factors influencing the distribution of aquatic 
plants in Minnesota. American Midland Naturalist 34(2): 402-20. 
Munro, Je Ae 1939. The relation of loons, holboel's grebes, and coots to duck 
populations. Joum. Wildl. Met. 3() : 339-3hh. 
Reeve, A, J. 1949. A study of the muskrat marshes of Manitoba - 199. (Unpublished. ) 
Russenholt, E. S. 192. What the sportsman is doing through Ducks Unlimited, 
Trans. 7th North American Wildl. Conf., pp. 35-38. 
