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 1. Bjerke, K. 1991. An overview of the agricultural resources conservation 
    program. In L. A. Joyce, J. E. Mitchell, and M. D. Skold, (eds.), The 
    Conservation Reserve—Yesterday, Today and Tomorrow. Symp. Proc., Jan. 
    14, 1991, Washington, D.C. USDA Forest Serv., Gen. Tech. Rep. RM-203.

 2. Clark, R.G., and T.D. Nudds. 1991. Habitat patch size duck nesting 
    success: The crucial experiments have not been performed. Wildl. Soc. 
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 3. Cowardin, L.M., A.B. Sargeant, and H.F. Duebbert. 1983. Problems and 
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 4. Duebbert, H.F. 1969. High nest density and hatching success of ducks in 
    South Dakota CAP land. Trans. N. Am. Wildl. Nat. Resour. Conf. 34:218-228.

 5. Duebbert, H.F., E.T. Jacobson, K.F. Higgins, and E.B. Podoll. 1981. 
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    pothole region. Fish Wildl. Serv. Spec. Sci. Rep.—Wildl. 234. U.S. 
    Dept. Int., Washington, D.C.

 6. Duebbert, H.F., and H.A. Kantrud. 1974. Upland duck nesting related to land 
    use and predator reduction. J. Wildl. Manage. 38: 257-265.

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

 8. Duebbert, H.F., and J.T. Lokemoen. 1976. Duck nesting in fields of 
    undisturbed grass-legume cover. J. Wildl. Manage. 40: 39-49.

 9. Higgins, K.F., and W.T. Barker. 1982. Changes in vegetation structure in 
    seeded nesting cover in the prairie pothole region. Fish Wildl. Serv. Spec. 
    Sci. Rep—Wildl. 242. U.S. Dept. Int., Washington, D.C.

10. Johnson, D.H. 1979. Estimating nest success: The Mayfield method and an 
    alternative. Auk 96: 651-661.

11. Kirsch, L.M., H.F. Duebbert, and A.D. Kruse. 1978. Grazing and haying 
    effects on habitats of upland nesting birds. Trans. N. Am. Wildl. Nat. 
    Resour. Conf. 43: 486-497.

12. Klett, A.T., H.F. Duebbert, C.A. Faanesr, and K.F. Higgins. 1986. 
    Techniques for studying nest success of ducks in upland habitats in the 
    prairie pothole region. Fish Wildl. Serv. Resour. Publ. 158. U.S. Dept. 
    Int., Washington, D.C.

13. Klett, A.T., H.F. Duebbert, and G.L. Heismeyer. 1984. Use of seeded native 
    grasses as nesting cover by ducks. Wildl. Soc. Bull. 12: 134-138.

14. 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. 

15. Lokemoen, J.T., H.F. Duebbert, and D.E. Sharp. 1984. Nest spacing, habitat 
    selection, and behavior of waterfowl on Miller Lake Island, North Dakota. 
    J. Wildl. Manage. 48: 309-321.

16. Luttschwager, K.A., and K.F. Higgins.  1991. Some sociological and 
    ecological effects of the Conservation Reserve Program in the Northern 
    Great Plains. In L. A. Joyce, J. E. Mitchell, and M. D. Skold, (eds.), The 
    conservation reserve—Yesterday, today and tomorrow. Washington, D.C. 
    USDA Forest Serv., Gen. Tech. Rep. RM-203.
    
17. Milliken, G.A., and D.E. Johnson. 1984.  Analysis of Messy Data. Vol. 1: 
    Designed Experiments. Van Nostrand Reinhold, New York, NY.
    
18. Moyle, J.B., ed. 1964. Ducks and land use in Minnesota. Minn. Dept. 
    Conserv. Tech. Bull. 8.
    
19. Robel, R.J., J.N. Briggs, A.D. Dayton, and L.C. Hulbert. 1970. 
    Relationships between obstruction measurements and weight of grassland 
    vegetation. J. Range Manage. 23: 295-297.
    
20. SAS Institute, Inc. 1987. SAS/STAT Guide for Personal Computers, Version 6 
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21. Smith, A.G., J.H. Stoudt, and J.B. Gollop. 1964. Prairie potholes and 
    marshes. In J. P. Linduska (ed.), Waterfowl tomorrow. U.S. Fish Wildl. 
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22. Snedecor, G.W., and W.G. Cochran. 1980. Statistical Methods. Seventh ed. 
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23. Stewart, R.E., and H.A. Kantrud. 1971. Classification of natural ponds and 
    lakes in the glaciated prairie region. Fish Wildl. Serv. Resour. Publ. 92. 
    U.S. Dept. Int., Washington, D.C.