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Adorjan, A. S. and G. B. Kolenosky.  1969.  A manual for the identification of 
	hairs of selected Ontario mammals. Ontario Dept. Lands and Forests 
	Research Rep. No. 90. 64 p.

Bjerke, K.  1991.  An overview of the agriculture resources conservation 
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Errington, P. L.  1937.  Summer food habits of the badger in northwestern Iowa. 
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Greenwood, R. J.  1981.  Foods of prairie raccoons during the waterfowl nesting 
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Greenwood, R. J., A. B. Sargeant, D. H. Johnson, L. M. Cowardin and T. L. 
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Jackson, D. H., H. H. Prince and R. A. Bishop.  1985.  Influence of drought on 
	mallards breeding in northern Iowa. J. Wildl. Manage., 49:442-448.

Jense, G. K.  1968.  Food habits and energy utilization of badgers. M.S. Thesis. 
	South Dakota State Univ., Brookings. 39 p.

Jones, J. K., Jr. and E. C. Birney.  1988.  Handbook of mammals of the north 
	central states. Univ. Minnesota Press, Minneapolis. 346 p.

Klett, A. T., T. L. Shaffer and D. H. Johnson.  1988.  Duck nest success in the 
	Prairie Pothole Region. J. Wildl. Manage., 52:431-440.

Krapu, G. L., A. T. Klett and D. G. Jorde.  1983.  The effect of variable spring 
	water conditions on mallard reproduction. Auk, 100:689-698.

Lampe, R. P.  1982.  Food habits of badgers in east central Minnesota. J. Wildl. 
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Long, C. A. and C. A. Killingley.  1983.  The badgers of the world. Charles C. 
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Mallory, M. L. and P. J. Weatherhead.  1990.  Effects of nest parasitism and 
	nest location on eggshell strength in waterfowl. Condor, 92:1031-1039.

Messick, J. P.  1987.  North American badger. p. 587-597 In: M. Novak, J. A. 
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Messick, J. P. and M. G. Hornocker.  1981.  Ecology of the badger in southwestern 
	Idaho. Wildl. Monogr. 76. 17 p.

Messick, J. P., M. C. Todd, and M. G. Hornocker.  1981.  Comparative ecology of 
	two badger populations. p. 1290-1304 In: J. A. Chapman and D. Pursley 
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Moore, T. D., L. E. Spence, and C. E. Dugnolle.  1974.  Identification of the 
	dorsal guard hairs of some mammals of Wyoming. Wyoming Game and Fish 
	Dept. Bull. No. 14.

Sargeant, A. B., S. H. Allen and J. P. Fleskes.  1986.  Commercial sunflowers: 
	Food for red foxes in North Dakota. Prairie Nat., 18:91-94.

Sargeant, A. B., M. A. Sovada and T. L. Shaffer.  1995.  Seasonal predator 
	removal relative to hatch rate of duck nests in waterfowl production 
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Snead, E. and G. O. Hendrickson.  1942.  Food habits of the badger in Iowa. J. 
	Mammal., 28:380-391.

Steel, R. G. D. and J. H. Torrie.  1980.  Principles and procedures of 
	statistics: a biometrical approach, 2nd ed. Mcgraw-Hill Bock Co., 
	New York. 633 p.

Todhunter, P. 1995. Hydroclimate perspectives on waterfowl production in the 
	North Dakota prairie pothole region. Great Plains Res., 5:137-162.

U.S. Fish and Wildlife Service and Canadian Wildlife Service.  1995.  Waterfowl 
	population status. U. S. Fish and Wildl. Serv. Off. Migr. Bird Manage., 
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Wallis, R. L.  1993.  A key for identification of guard hairs of some Ontario 
	Mammals. Can. J. Zool., 71:587-591.