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Anderson, M. G., Emery, R. B. and Arnold, T. W.:  1997, 'Reproductive success 
     and female survival affect local population density of canvasbacks', 
     Journal of Wildlife Management 61, 1174-1191.
 
Batt, B. D. J., Anderson, M. G., Anderson, C. D. and Caswell, F. D.: 1989, 
     'The Use of Prairie Potholes by North American Ducks', in A. van der Valk 
     (ed.), Northern Prairie Wetlands, Iowa State University Press, Ames, 
     IA, pp. 204-227.
     
Bethke, R. W. and Nudds, T. D.: 1995, 'Effects of climate change and land use 
      on duck abundance in the Canadian prairie-parklands', Ecological 
      Applications 5, 588-600.

Cowardin, L. M.: 1997, 'Design methods', in S. A. Peterson, L. Carpenter, G. R. 
      Guntenspergen and L. M. Cowardin (eds), Pilot Test of the Wetland 
      Condition Indicators in the Prairie Pothole Region of the United States,
      U.S. Environmental Protection Agency, Office of Research and Development 
      EPA/620/R-97/002, pp. 11-19.

Cowardin, L. M., Carter, V. M., Golet, F. C. and LaRoe, E. T.: 1979, 
     'Classification of wetlands and deepwater habitats of the United States',  
     U.S. Fish and Wildlife Service, Biological Services Program FWS/OBS-79/31,
     103 pp.

Cowardin, L. M., Johnson, D. H., Frank, A. M. and Klett, A. T.: 1988a, 
     'Simulating results of management actions on mallard production', Trans. 
     North American Wildlife and Natural Resource Conference 48, 257-272.

Cowardin, L. M., Johnson, D. H., Shaffer, T. L. and Sparling, D. W.: 1988b, 
     'Applications of a simulation model to decisions in mallard management',
     U.S. Fish and Wildlife Service Technical Report 17, 28 pp.

Cowardin, L. M. and Peterson, S. A.: 1997. 'Introduction', in  S. A. Peterson,
     L. Carpenter, G. R. Guntenspergen and L. M. Cowardin (eds), Pilot Test of 
     the Wetland Condition Indicators in the Prairie Pothole Region of the 
     United States,  U.S. Environmental Protection Agency, Office of Research 
     and Development  EPA/620/R-97/002, pp. 1-9.
 
Cowardin, L. M., Shaffer, T. L. and Arnold, P. M.:  1995, 'Evaluations of duck 
     habitat and estimation of duck population sizes with a remote-sensing-based 
     system'.  National Biological Service, Biological Science Report 2, 26 pp.

Cowardin, L. M., and Sklebar, H. T.: 1997, 'Tests of Selected Landscape 
     Indicators of Wetland Condition',  in S. A. Peterson, L. Carpenter, G. R.
     Guntenspergen and L. M. Cowardin (eds), Pilot Test of Wetland Condition 
     Indicators in the Prairie Pothole Region of the United States, U.S. 
     Environmental Protection Agency, Office of Research and Development 
     EPA/620/R-97/002, pp. 23-57.

Greenwood, R. J., Sargeant, A. B., Johnson, D. H., Cowardin, L. M. and Shaffer, 
     T. L.: 1995, 'Factors associated with duck nest success in the prairie 
     pothole region of Canada', Wildlife Monographs 128, 57 pp.

Johnson, D. H.: 1996, 'Waterfowl communities in the Northern Great Plains', in M. 
     L. Cody and J. A. Smallwood (eds), Long-Term Studies of Vertebrate 
     Communities,  Academic Press, San Diego, CA, pp. 391-418.

Johnson, D. H., Sparling, D. W. and Cowardin, L. M.: 1987, 'A model of the 
     productivity of the mallard duck', Ecological Modeling 38, 257-275.

Kantrud, H. A., Krapu, G. L., and Swanson, G. L.: 1989, 'Prairie basin wetlands 
     of the Dakotas: A community profile', U.S. Fish and Wildlife Service 
     Biological Report 85(7.28), 111 pp.

Klett, A. T. , Shaffer, T. L. and Johnson, D. H.: 1988, 'Duck nest success in 
     the Prairie Pothole Region', Journal of Wildlife Management 52, 431-440.

Milliken, G. A. and Johnson, D.E.: 1992, Analysis of Messy Data.  Volume 1: 
     Designed experiments, Chapman and Hall, New York, NY.
 
Myers, R. H.: 1990, Classical and modern regression with applications, PWS-Kent 
     Publishing Co., Boston, MA.

National Climate Data Center: 1998, 'Climate Division Precipitation, Temperature
     and Drought Data', National Oceanic Atmospheric Administration, National
     Climate Data Center, http://www.ncdc.noaa.gov/onlineprod/drought/main.html. 

Naugle, D. E., Higgins, K. F., Nusser, S.M. and Johnson, W. C.: 1999, 'Scale-
     dependent habitat use in three species of prairie wetland birds', Landscape 
     Ecology 14, 267-276.

Neter, J., Wasserman, W. and Kutner, M. H.: 1990, Applied linear statistical 
     models.  Regression, analysis of variance, and experimental designs, 3rd 
     edition, Irwin, Homewood, IL.

Peterson, S. A.: 1994, 'The Environmental Monitoring and Assessment Program 
     (EMAP): Its Objectives, Approach and Status Relative to Wetlands', in G. 
     Aubrect, G. Dick, and C. Prentice (eds), Monitoring of Ecological Change 
     in Wetlands of Middle Europe, Proceedings of an international workshop,
     Linz, Austria, Staphia 31, Linz Austria, and IWRB Special Publication 30, 
     Slimbridge, U.K.

Peterson, S. A., Carpenter, L., Guntenspergen, G. R. and Cowardin L. M. (eds):
     1997, 'Pilot test of the wetland condition indicators in the prairie 
     pothole region of the United States',  U.S. Environmental Protection 
     Agency, Office of Research Development  EPA/620/R-97/002.

SAS Institute, Inc.: 1997, SAS user's guide, Version 6, 5th edition, SAS 
     Institute, Inc., Cary, NC.

Serie, J. R., Trauger, D. L. and Austin, J. E.:  1992, 'Influence of age and 
     selected environmental factors on reproductive performance of canvasbacks',
     Journal of Wildlife Management 56, 546-556.
 
Sorenson, M. D.: 1991, 'The functional significance of parasitic egg laying and 
     typical nesting in redhead ducks: An analysis of individual behavior', 
     Animal Behaviour 42, 771-796.

Stewart, R. E. and Kantrud, H. A.: 1971, 'Classification of natural ponds and 
     lakes in the glaciated prairie region', U.S. Fish and Wildlife Service 
     Resource Publication 92, 57 pp.

U.S. Fish and Wildlife Service:  1997, 'Status of waterfowl and fall flight 
     forecast', U.S. Department of Interior, Fish and Wildlife Service,
     Washington, D.C.