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BOWEN, B. S., AND A. D. KRUSE. 1993. Effects of grazing on nesting by upland 
     sandpipers in south-central North Dakota. J. Wildl. Manage. 57:291-301.

BYERS, C. R., R. K. STEINHORST, AND P. R. KRAUSMAN. 1984. Clarification of a 
     technique for analysis of utilization-availability data. J. Wildl. 
     Manage. 48:1050-1053.

COWARDIN, L. M., AND R. J. BLOHM. 1992. Breeding population inventories and 
     measures of recruitment. Pages 423-445 in B. D. J. Batt et al., eds. 
     Ecology and management of breeding waterfowl. Univ. Minnesota Press, 
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_____, AND D. H. JOHNSON. 1979. Mathematics and mallard management. J. Wildl. 
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_____, V. CARTER, F. C. GOLET, AND E. T. LaRoe. 1979. Classification of 
     wetlands and deepwater habitats of the United States. U.S. Fish 
     and Wildl. Serv. Biol. Serv. Program FWS/OBS-79/31. 103pp.

_____,D. S. GILMER, AND C. W. SHAIFFER. 1985. Mallard recruitment in the 
     agricultural environment of North Dakota. Wildl. Monogr. 92. 37pp.

DUEBBERT, H. F., J. T. LOKEMOEN, AND D. E. SHARP. 1983. Concentrated nesting 
     of mallards and gadwalls on Miller Lake Island, North Dakota. J. Wildl. 
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_____, AND _____. 1986. Nest sites of ducks in grazed mixed-grass prairie in North 
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DZUBIN, A., AND J. B. GOLLOP. 1972. Aspects of mallard breeding ecology in 
     Canadian parkland and grassland. Pages 113-152 in Population ecology 
     of migratory birds: a symposium. U.S. Fish and Wildl. Serv. Wildl. 
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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. 
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GOODMAN S. N., AND J. A. BERLIN. 1994. The use of predicted confidence 
     intervals when planning experiments and the misuse of power when 
     interpreting results. Ann. Intern. Med. 121:200-206.

GREAT PLAINS FLORA ASSOCIATION. 1986. Flora of the Great Plains. Univ. Press 
     of Kansas, Lawrence. 1392pp.

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.

HINES, J. E., AND G. J. MITCHELL. 1983. Breeding ecology of the gadwall at 
     Waterhen Marsh, Saskatchewan. Can. J. Zool. 61:1532-1539.

HOLECHEK, J. L., R. VALDEZ, S. D. SCHEMNITZ, R. D. PTEPER, AND C. A. DAVIS. 
     1982. Manipulation of grazing to improve or maintain wildlife habitat. 
     Wildl. Soc. Bull. 10:204-210.

JOHNSON, D. H. 1979. Estimating nest success: the Mayfield method and an 
     alternative. Auk 96:651-661.

JOURNAL OF WILDLIFE MANAGEMENT. 1995. Journal News. J. Wildl. Manage. 
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KADLEC, J. A., AND L. M. SMITH. 1992. Habitat management for breeding areas. 
     Pages 590-610 in B. D. J. Batt et al., eds. Ecology and management of 
     breeding waterfowl. Univ. Minnesota Press, Minneapolis.

KIRSCH, L. M., AND A. D. KRUSE. 1972. Prairie fires and wildlife. Proc. Tall 
     Timbers Fire Ecol. Conf. 12:289-303.

_____, H. F. DUEBBERT, AND A. D. KRUSE. 1978. Grazing and haying effects on 
     habitats of upland nesting birds. Trans. North Am. Wildl. 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.

_____, 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., L. G. TALENT, AND T. J. DWYER. 1979. Marsh nesting by mallards. 
     Wildl. Soc. Bull. 7:104-110.

LOKEMOEN, J. T., H. F. DUEBBERT, AND D. E. SHARP. 1990. Homing and reproductive 
     habits of mallards, gadwalls, and blue-winged teal. Wildl. Monogr. 106. 28pp.

MAYFIELD, H. 1961. Nesting success calculated from exposure. Wilson Bull. 
     73:255-261.

MILLIKEN, G. A., AND D. E. JOHNSON. 1984. Analysis oi messy data. Van Nostrand 
     Reinhold, New York, N.Y. 473pp.

NEU, C. W., C. R. BYERS, AND J. M. PEEK. 1974. A technique for analysis of 
     utilization-availability data. J. Wildl. Manage. 38:541-545.

ROBEL, R. J., J. N. BRIGGS, A. D. DAYTON, AND L. C. HULBERT. 1970. Relationships 
     between visual obstruction measurements and weight of grassland vegetation. 
     J. Range Manage. 23:295-297.

SAS INSTITUTE INC. 1987. SAS/STAT user's guide. Version 6. SAS Inst. Inc., 
     Cary, N.C. 1028pp.

SCOTT, T. G., AND C. H. WASSER. 1980. Checklist of North American plants for 
     wildlife biologists. The Wildlife Society, Washington, D.C. 58pp.

STEEL, R. G. D., AND J. H. TORRIE. 1980. Principles and procedures of statistics, 
     Second ed. McGrawHill Book Co., New York, N.Y. 633pp.

STEWART, R. E., AND H. A. KANTRUD. 1973. Ecological distribution of breeding 
     waterfowl populations in North Dakota. J. Wildl. Manage. 37:39-50.

THOMAS, D. L., AND E. J. TAYLOR. 1990. Study designs and tests for comparing 
     resource use and availability. J. Wildl. Manage. 54:322-330.

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