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BALSER, D. S., DILL, H. H., and NELSON, H. K. 1968. Effect of predator reduction 
       on waterfowl nesting success. J. Wildl. Manage. 32:669-682.
       
BEINTEMA, A. J., and MUSKENS, G. J. D. M. 1987. Nesting success of birds breeding 
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BELLROSE, F. C. 1980. Ducks, geese and swans of North America. Stackpole Books, 
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BOYD, H. 1981. A fair future for prairie ducks; cloudy further north. Trans. N. 
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CHOROMANSKI-NORRIS, J. F. 1983. The ecology of the Franklin's ground squirrel in 
       North Dakota. M.S. thesis, University of Missouri, Columbia.
       
COWARDIN, L. M., GILMER, D. S., and SHAIFFER, C. W. 1985. Mallard recruitment 
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DEKKER, D. 1983. Denning and foraging habits of red foxes, Vulpes vulpes, and 
       their interactions with coyotes, Canis latrans, in central Alberta, 
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DUEBBERT, H. F. 1982. Nesting of waterfowl on islands in Lake Audubon, North 
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DUEBBERT, H. F., and KANTRUD, H. A. 1974. Upland duck nesting related to land
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DUEBBERT, H. F., and LOKEMOEN, J. T. 1976. Duck nesting in fields of undisturbed
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DUEBBERT, H. F., LOKEMOEN, J. T., and SHARP, D. E. 1983. Concentrated nesting of 
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ELLIG, L. J. 1955. Waterfowl relationships to Greenfields Lake, Teton County, 
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GOLLOP, J. B. 1965. Wetland inventories in western Canada. Proc. Int. Congr. 
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GREENWOOD, R. J. 1986. Influence of striped skunk removal on upland duck nest 
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GREENWOOD, R. J., SARGEANT, A. B., JOHNSON, D. H., COWARDIN, L. M., and SHAFFER, 
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HAMMOND, M. C. 1940. Crow-waterfowl relationships on federal refuges. Trans. 
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HIGGINS, K. F. 1977. Duck nesting in intensively farmed areas of North Dakota. 
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HIGGINS, K. F., KIRSCH, L. M., DUEBBERT, H. F., KLETT, A. T., LOKEMOEN, J. T., 
       MILLER, H. W., and KRUSE, A. D. 1977. Construction and operation of 
       cable-chain drag for nest searches. U. S. Fish Wildl. Serv. Wildl. Leafl. 
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HILDEN, O. 1964. Ecology of duck populations in the island group of Valassaaret, 
       Gulf of Bothnia. Ann. Zool. Fenn. 1:153-279.
       
JOHNSON, D. H. 1979. Estimating nest success: the Mayfield method and an 
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JONES, R. E., and HUNGERFORD, K. E. 1972. Evaluation of nesting cover as 
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KALMBACH, E. R. 1937. Crow-waterfowl relationships in the prairie provinces. 
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______.	1938. A comparative study of nesting waterfowl on the Lower Souris 
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KEITH, L. B. 1961. A study of waterfowl ecology on small impoundments in 
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KLETT, A. T., DUEBBERT, H. F., FAANES, C. A., and HIGGINS, K. F. 1986. 
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KLETT, A. T., SHAFFER, T. L., and JOHNSON, D. H. 1988. Duck nest success in the 
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LARSON, S. 1960. On the influence of the Arctic fox Alopex lagopus on the 
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LOKEMOEN, J. T., DOTY, H. A., SHARP, D. E., and NEAVILLE, J. E. 1982. Electric 
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MAJOR, J. T., and SHERBURNE, J. A. 1987. Interspecific relationships of coyotes, 
       bobcats, and red foxes in western Maine. J. Wildl. Manage. 51:606-616.
       
MARTZ, G. F. 1967. Effects of nesting cover removal on breeding puddle ducks. J. 
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MAYFIELD, H. 1961. Nesting success calculated from exposure. Wilson Bull. 73:
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MCINVAILLE, W. B., JR., and KEITH, L. B. 1974. Predator-prey relations and 
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PEHRSSON, O. 1985. Duckling production of the Oldsquaw in relation to spring 
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SARGEANT, A. B. 1972. Red fox spatial characteristics in relation to waterfowl 
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SARGEANT, A. B., and ARNOLD, P. M. 1984. Predator management for ducks on 
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SARGEANT, A. B., GREENWOOD, R. J., PIEHL, J. L., and BICKNELL, W. B. 1982. 
       Recurrence, mortality, and dispersal of prairie striped skunks, Mephitis 
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SARGEANT, A. B., ALLEN, S. H., and EBERHARDT, R. T. 1984. Red fox predation on 
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SARGEANT, A. B., ALLEN, S. H., and HASTINGS, J. O. 1987a. Spatial relations 
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SARGEANT, A. B., SOVADA, M. A., and GREENWOOD, R. J. 1987b. Responses of 
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SHAW, S. P., and FREDINE, C. G. 1956. Wetlands of the United States. U. S. 
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SMITH, A. G. 1971. Ecological factors affecting waterfowl production in the 
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SMITH, A. G., STOUDT, J. H., and GOLLOP, J. B. 1964. Prairie potholes and 
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SOWLS, L. K. 1948. The Franklin ground squirrel, Citellus franklinii (Sabine), 
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STOUDT, J. H. 1971. Ecological factors affecting waterfowl production in the 
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SUGDEN, L. G., and BEYERSBERGEN, G. W. 1987. Effects of nesting cover density 
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SUMMERS, R. W. 1986. Breeding production of dark-bellied brent geese Branta 
      bernicla bernicla in relation to lemming cycles. Bird Study, 33:105-108.
      
VOIGT, D. R., and EARLS, B. D. 1983. Avoidance of coyotes by red fox families. 
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WELLER, M. W. 1956. A simple field candler for waterfowl eggs. J. Wildl. 
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