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Bragg, O.M., P.D. Hulme, H.A.P. Ingram, J.P. Johnston, and A.I.A. Wilson. 1994. 
     A maximum-minimum recorder for shallow water tables, developed for 
     ecohydrological studies on mires. Journal Applied Ecology 31:589-592.

Cowardin, L.M., V. Carter, F.C. Golet, and E.T. LaRoe. 1979. Classification of 
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Cowardin, L.M., D.H. Johnson, T.L. Shaffer, and D.W. Sparling.  1988. 
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Cowardin, L.M. and S.R. Peterson. 1995. Objectives of EMAP program.  p. 2-10. 
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Dahl, T.E. 1990. Wetland losses in the United States 1780's to 1980's. U.S. 
     Fish and Wildlife Service, Washington, DC, USA.

Fellows, D.P. and T.K. Buhl. 1995. Research access to privately owned wetland 
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Freeland A.F. and J.L. Richardson. 1995. Soils and sediments as indicators of 
     agricultural impacts on northern prairie wetlands. p. 159-197. In Final 
     Report on pilot test of indicators of wetland condition. U.S. 
     Environmental Protection Agency, Washington, DC, USA. (in press)

Grue, C.E., M.W. Tome, T.A. Messmer, D.B. Henry, G.A. Swanson, and L.R. DeWeese. 
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     the resource and the farmer--U. S. perspective. Transactions North American 
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Hutchinson, G.E. 1967. A Treatise on Limnology. Volume II. Introduction to Lake 
     Biology and the Limnoplankton.  John Wiley and Sons, New York, NY, USA.

LaBaugh, J.W., T.C. Winters, G.A. Swanson, D.O. Rosenberry, R.D. Nelson, and N.H. 
     Euliss, Jr. 1996. Changes in atmosphere circulation patterns affect 
     mid-continent wetlands sensitive to climate.  Limnology and Oceanography 
     41:864-870.

Macan, T.T. 1961. Factors that limit the range of freshwater animal communities. 
     Biological Revue 52:45-70.

Martin, D.B. and W.A. Hartman. 1987. The effect of cultivation on sediment and 
     deposition in prairie pothole wetlands. Water, Air, and Soil Pollution 
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Milliken, G.A. and D.E. Johnson. 1984. Analysis of Messy Data.  Volume I. Designed 
     Experiments. Van Nostrand Reinhold Company, New York, NY, USA.

Moyle, J.B. 1945. Some chemical factors influencing the distribution of aquatic 
     plants in Minnesota. American Midland Naturalist 34:402-420.

National Research Council. 1982. Impacts of emerging agricultural trends on fish 
     and wildlife habitat. National Academy Press, Washington, DC, USA.

Potts, W.T.W. and G. Parry. 1964. Osmotic and Ionic Regulation in Animals. Pergamon 
     Press, Oxford, England.

Richter K.O. 1995. A manual water level fluctuation gage to monitor wetland 
     hydroperiod. Insert. In C. Botha (ed.) Society of Wetland Scientists 
     Pacific Northwest Chapter Newsletter, December Kirkland, WA, USA.

SAS Institute, Inc. 1989. SAS/STAT User's Guide. Version 6. Cary, NC, USA.

Steel, R.G.D. and J.H. Torrie. 1980. Principles and Procedures of Statistics, a 
     Biometrical Approach, second edition. McGraw-Hill Book Company, New York, 
     NY, USA.

Stewart, R.E. and H.A. Kantrud. 1971. Classification of natural ponds and lakes 
     in the glaciated prairie region. U.S. Fish and Wildlife Service 
     Professional Paper 585-D.

Swanson, G.A. 1987. An introduction to the Cottonwood Lake area.  Proceedings, 
     North Dakota Academy of Science 41:25.

Tiner, R.W. 1984. Wetlands of the United States: current status and recent 
     trends. U.S. Fish and Wildlife Service, Washington, DC, USA.

van der Valk, A. (ed.). 1989. Northern Prairie Wetlands. Iowa State University 
     Press, Ames, IA, USA.

Wetzel, R.G. 1983. Limnology, second edition. Saunders College Publishing, 
     New York, NY, USA.

Winter, T.C. and M.R. Carr. 1980. Hydrologic setting of wetlands in the 
     Cottonwood Lake area, Stutsman County, North Dakota.  U.S. 
     Geological Survey Water Resources Investigation 80-99.

Winter, T.C. and D.O. Rosenberry. 1995. The interaction of ground water with 
     prairie pothole wetlands in the Cottonwood Lake area, east-central North 
     Dakota, 1979-1990. Wetlands 15:193-211.

Manuscript received 2 October 1995; revision received 3 June 1996; accepted 
     25 June 1996.