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American Ornithologists' Union. 1957. Check-list of North American birds, 

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1973a. Thirty-second supplement to the "American Ornithologists' 

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Anderson, D. R. 1975. Population Ecology of the Mallard part V. U.S. Fish 

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, and K. P. Burnham. 1976. Population Ecology of the Mallard part VI. 



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Attwood, Stanley B. 1973. The Length and Breadth of Maine. Maine Studies 

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Carney, S. M. , M. F. Sorensen, and E. M. Martin. 1978. Average Harvest of 

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Coulter, M. W. , and W. R. Miller. 1968. Nesting Biology of Black Ducks and 

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