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BREWSTER, W. G., J. M. GATES, and L. D. FLAKE. 1976. Breeding waterfowl 
     populations and their distribution in South Dakota. J. Wildl. Manage. 
     40:50-59.

COWARDIN, L. M., D. S. GILMER, and C. W. SHAIFFER. 1985. Mallard recruitment in 
     the agricultural environment of North Dakota. Wildl. Monogr. 92. 37pp.

______, and D. H. JOHNSON. 1979. Mathematics and mallard management. J. Wildl. 
     Manage. 43: 18-35.
	
______,	A. M. FRANK, and A. T. KLETT. 1983. Simulating results of management 
     actions on mallard production. Trans. North Am. Wildl. and Nat. Resour.
     Conf. 48:257-272.

CRISSEY, W. F. 1969. Prairie potholes from a continental viewpoint. Pages 161-
     171 in Saskatoon wetland seminar. Can. Wildl. Serv. Rep. Ser. 6.

DUEBBERT, H. F., and H. A. KANTRUD. 1987. Use of no-till winter wheat by nesting
     ducks in North Dakota. J. Soil and Water Conserv. 42:50-53.

EVANS, C. D., and K. E. BLACK. 1956. Duck production studies on the prairie 
     potholes of South Dakota. U.S. Fish and Wildl. Serv. Spec. Sci. Rep. 32. 
     59pp.

HIGGINS, K. F., L. M. KIRSCH, H. F. DUEBBERT, A. T. KLETT, J. T. LOKEMOEN, H. 
     W. MILLER, and A. D. KRUSE. 1977. Construction and operation of cable-
     chain drag for nest searches. U.S. Fish and Wildl. Serv. Wildl. Leafl. 
     512. 14pp.

JESSEN, R. L., J. P. LINDMEIER, and R. E. FARMES. 1964. A study of duck nesting 
     and production as related to land use in Mahnomen County, Minnesota. Pages
     26-82 in J. B. Moyle, ed. Ducks and land use in Minnesota. Minn. Dep. 
     Conserv. Tech. Bull. 8.

JOHNSON D. H. 1979. Estimating nest success: the Mayfield method and an 
     alternative. Auk 96: 651-661.
	
______, D. W. SPARLING, and L. M. COWARDIN. 1987. A model of the productivity 
     of the mallard duck. Ecol. Model. 38:257-275.


KIRSCH, L. M., H. F. DUEBBERT, and A. D. KRUSE. 1978. Grazing and haying 
     effects on habitats of upland nesting birds. Trans. North Am. Wildl. and 
     Nat. Resour. Conf. 43:486-497.

KLETT, A. T., H. F. DUEBBERT, C. A. FAANES, and K. F. HIGGINS. 1986. Techniques 
     for studying nest success of ducks in upland habitats in the prairie 
     pothole region. U.S. Fish and Wildl. Serv. Resour. Publ. 158. 24pp.


MARTIN, F. W., R. S. POSPAHALA, and J. D. NICHOLS. 1979. Assessment and 
     population management of North American migratory birds. Pages 187-239 in
     J. Cairns, Jr., G. P. Patil, and W. E. Waters, eds. Environmental 
     biomonitoring, assessment, prediction, and management--certain case studies
     and related quantitative issues. Int. Co-operative Publ. House, Fairland, 
     Md.

MAYFIELD, H. 1961. Nesting success calculated from exposure. Wilson Bull. 73:
     255-261.
	
______. 1975. Suggestions for calculating nest success. Wilson Bull. 87:456-
     466.

SARGEANT, A. B., and P. M. ARNOLD. 1984. Predator management for ducks on 
     waterfowl production areas in the northern plains. Vertebr. Pest Conf.
     11:161-167.

SMITH, A. G., J. H. STOUDT, and J. B. GOLLOP. 1964. Prairie potholes and 
     marshes. Pages 39-50 in J. P. Linduska, ed. Waterfowl tomorrow. U.S. Gov.
     Printing Off., Washington, D.C.

SNEDECOR, G. W., and W. G. COCHRAN. 1980. Statistical methods. Seventh ed. Iowa
     State Univ. Press, Ames. 507pp.

STEWART, R. E., and H. A. KANTRUD. 1971. Classification of natural ponds and 
     lakes in the glaciated prairie region. U.S. Fish and Wildl. Serv. Resour. 
     Publ. 99. 57pp.
	
______, and _______. 1973. Ecological distribution of breeding waterfowl 
     populations in North Dakota. J. Wildl. Manage. 37:39-50.

UNITED STATES FISH and WILDLIFE SERVICE. 1986. North American waterfowl 
     management plan. U.S. Fish and Wildl. Serv., Washington, D.C. 33pp.

WELLER, M. W. 1956. A simple field candler for waterfowl eggs. J. Wildl. Manage.
     20:111-113.