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Bellrose, F. C. 1976. Ducks, Geese and Swans of North America. Stackpole Books, 
     Harrisburg, PA, USA.
     
Borror, D. J., D. M. De Long, and C. A. Triplehorn. 1981. An Introduction to 
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Elliott, J. M. 1977. Some methods for the statistical analysis of samples of 
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Euliss, N. H., Jr., and G. A. Swanson. 1989. Improved self-cleaning screen for
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Euliss, N. H., Jr., G. A. Swanson, and J. MacKay. 1992. Multiple tube sampler 
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Grodhaus, G. 1967. Identification of chironomid midges commonly associated with 
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Hicks, J. M. 1992. Aquatic invertebrate community structure near waterfowl 
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Hunter, B. F. 1970. Ecology of waterfowl botulism toxin production. Transactions
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McGilvrey, F. B. 1966. Fall food habits of ducks near Santee Refuge, South 
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Miller, M. R. 1987. Fall and winter foods of northern pintails in the 
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Minshall, G. W. 1984. Aquatic insect-substratum relationships. p. 358-400. In 
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Pederson, G. B. and R. L. Pederson. 1983. Feeding ecology of pintails and 
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Resh, V. H. 1979. Sampling variability and life history features: basic 
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Ringelman, J. K. 1990. Habitat management for molting waterfowl. p. 13.4.4.1-6. 
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Rosen, M. N. 1971. Botulism. p. 100-117. In J. W. Davis, R. C. Anderson, L. 
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Sugden, L. G. and E. A. Driver. 1980. Natural foods of mallards in Saskatchewan 
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Usinger, R. L. (ed.). 1956. Aquatic Insects of California. University of 
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Wobeser, G. A. 1987. Control of botulism in wild birds. p. 339-348. In M. W. 
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