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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 van der Valk, A. (ed.), 
     Northern Prairie Wetlands, Iowa State University Press, Ames, Iowa, 
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Boyd, H.: 1981, 'Prairie dabbling ducks, 1941-1990', Canadian Wildlife Service 
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Cess, R.D., Zhang, M.-H., Potter, G.L., Barker, H.W., Colman, R.A., Dazlich, 
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     P.V., Taylor, K.E., Wang, W.-C. and Wetherald, R.T.: 1993, 'Uncertainties 
     in carbon dioxide radiative forcing in atmospheric general circulation 
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Cushman, R.M. and Spring, P.N.: 1989, 'Differences among model simulations of 
     climate change on the scale of resource regions', Environ. Manage. 13, 
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Eisenlohr, W.S., Jr.: 1972, 'Hydrologic investigations of prairie potholes in 
     North Dakota, 1959-68', U.S. Geol. Surv. Prof. Pap. 585-A.

Golden Software, Inc.: 1991, 'Surfer, Version 4', Golden Software, Inc., Golden,
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Grotch, S.L.: 1988, 'Regional intercomparisons of general circulation model 
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Henny, C.J., Anderson, D.R. and Pospahala, R.S.: 1972, 'Aerial surveys of 
     waterfowl production in North America, 1955-1971', U.S. Fish Wildl. Serv. 
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Hogenbirk, J.C., Wein, R.W.: 1991, 'Fire and drought experiments in northern 
     wetlands: a climate change analogue', Can. J. Bot. 69, 1991-1997.

Isaaks, E.H. and Srivastava, R.M.: 1989, 'An introduction to applied 
     geostatistics', Oxford University Press, New York.

Johnson, D.H. and Grier, J.W.: 1988, 'Determinants of breeding distributions of 
     ducks', Wildl. Monogr. 100, 1-37.

Karl, T.R., Heim, R.R., Jr. and Quayle, R.G.: 1991a, 'The greenhouse effect in 
     central North America:  if not now, when?', Science 251, 1058-1061.

Karl, T.R., Kukla, G., Razuvayev, V.N., Changery, M.J., Quayle, R.G., Heim, R.R., 
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Karl, T.R., Williams, C.N., Jr. and Quinlan, F.T.: 1990, 'United States 
     Historical Climatology Network (HCN) serial temperature and precipitation 
     data', Oak Ridge National Laboratory NDP 091/R1.

Kiel, W.H., Jr., Hawkins, A.S. and Perret, N.G.: 1972, 'Waterfowl habitat trends 
     in the aspen parkland of Manitoba', Canadian Wildl. Serv. Rep. Ser. 18.

Larson, D.L.: 1994, 'Potential effects of anthropogenic greenhouse gases on 
     avian habitats and populations in the northern Great Plains', Am. Midl. Nat. 
     131, 330-346.

McCabe, G.J., Jr. and Wolock, D.M.: 1991, 'Detectability of the effects of a 
     hypothetical temperature increase on the Thornthwaite moisture index', 
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Meyboom, P.: 1966, 'Unsteady groundwater flow near a willow ring in hummocky 
     moraine', J. Hydrol. 4, 38-62.

National Wetlands Working Group: 1988, 'Wetlands of Canada', Sustainable 
     Development Branch, Environment Canada Ecological Land Classification 
     Series 24.

Overpeck, J.T., Rind, D., and Goldberg, R.: 1990, 'Climate-induced changes in 
     forest disturbance and vegetation', Nature 343, 51-53.

Poiani, K.A. and Johnson, W.C.: 1991, 'Global warming and prairie wetlands:  
     potential consequences for waterfowl habitat', BioScience 41, 611-618.

Poiani, K.A. and Johnson, W.C.: 1993, 'Potential effects of climate change on 
     a semi-permanent prairie wetland', Clim. Change 24, 213-232.

Sargeant, A.B., Greenwood, R.J., Sovada, M.A. and Shaffer, T.L.: 1993, 
     'Distribution and abundance of predators that affect duck production - 
     Prairie Pothole Region', U.S. Fish Wildl. Serv. Res. Publ. 194.

SAS Institute, Inc.: 1988, 'SAS/STAT User's Guide, Release 6.03 Edition', 
     SAS Institute Inc., Cary, North Carolina.

Shjeflo, J.B.: 1968, 'Evapotranspiration and the water budget of prairie 
     potholes in North Dakota', U.S. Geol. Surv. Prof. Pap. 585-B.

Smith, J.B. and Tirpak, D.A.: 1990, 'The Potential Effects of Global Climate 
     Change on the United States', Hemisphere Publishing Corp., New York.

Stewart, R.E. and Kantrud, H.A.: 1971, 'Classification of natural ponds and 
     lakes in the glaciated prairie region', U.S. Fish Wildl. Serv. Resour. 
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Winter, T.C.: 1989, 'Hydrologic studies of wetlands in the northern prairie', 
     in Van Der Valk, A. (ed.), Northern Prairie Wetlands, Iowa State University 
     Press, Ames, Iowa, pp. 16-54.

Woo, M.K. and Winter, T.C.: 1993, 'The role of permafrost and seasonal frost in 
     the hydrology of northern wetlands in North America', J. Hydrol. 141, 5-31.