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1.  U.S. Fish and Wildlife Service and Canadian Wildlife Service. (1986) North 
         American Waterfowl Management Plan.

2.  U.S. Prairie Pothole Joint Venture. (1995) Implementation Plan Update.

3.  Higgins, K. F., Kirsch, L. M., Klett, A. T. and Miller, H. W. (1992) Waterfowl
         production on the Woodworth Station in southcentral North Dakota, 1965-1981.  
         U.S. Fish Wildl. Serv. Resour. Publ. 180.

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

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

6.  Higgins, K. F. (1986) Further evaluation of duck nesting on small man-made islands 
         in North Dakota.  Wildl. Soc. Bull. 14,155-157.

7.  Higgins, K. F. (1986) A comparison of burn season effects on nesting birds in North 
         Dakota mixed-grass prairie.  Prairie Nat. 18,115-116.

8.  Johnson, D. H. and Sargeant, A. B. (1977) Impact of red fox predation on the sex 
         ratio of prairie Mallards.  U.S. Fish Wildl. Serv. Wildl. Res. Rept. 6.

9.  Sargeant, A. B., Allen, S. H. and Eberhardt, R. T. (1984) Red-fox predation on 
         breeding ducks in midcontinent North America.  Wildl. Monogr. No. 89.

10. Cowardin, L. M., D. H. Johnson, T. L. Shaffer and D. W. Sparling. (1988) 
         Applications of a simulation model to decisions in mallard management.  U.S. 
         Fish Wildl. Serv., Fish Wildl. Tech. Rept. 17.

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