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Andresen, H., J.P. Bakker, M. Brongers, B. Heydemann & U. Irmler, 1990. 
     Longterm changes of salt marsh communities by cattle grazing. 
     Vegetatio 89:137-148.

Bakker, J.P., 1985. The impact of grazing on plant communities, plant 
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Barker, W.T. & G.W. Fulton, 1979. Analysis of wetland vegetation on 
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Bazely, D.R. & R.L. Jeffries, 1986. Changes in composition and standing 
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Bergelson, J., 1990. Spatial patterning in plants: opposing effects 
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Bemard, J.M., 1974. Seasonal changes in standing crop and primary 
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Cowardin, L.M., D.H. Johnson, T.L. Shaffer & D.W. Sparling, 1988.  
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Hammond, M.C., 1961. Habitat improvement studies at Lower Souris 
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Jones, W.L. & W.C. Lehman, 1987. Phragmites control and revegetation 
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Kantrud, H.A., & R.E. Stewart, 1984. Ecological distribution and crude 
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Milliken, G.A. & D.E. Johnson, 1984. Analysis of Messy Data. Volume 1:  
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Reed, R B. Jr., 1988. National list of plant species that occur in 
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SAS Institute Inc., 1989. SAS/STAT User's Guide, Version 6, 4th 
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Schultz, B.D., 1987. Biotic responses of Typha-monodominant 
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Skrdla, M.P. 1992. A Guide to Map and Image Processing System.  
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Smeins. F.E., 1967. The wetland vegetation of the Red River Valley and 
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Smith, R.S. & S.P. Rushton, 1994. The effects of grazing management on 
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Stewart, R.E. & H.A. Kantrud, 1971. Classification of natural ponds and 
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Stewart, R.E. & H.A. Kantrud, 1972. Vegetation of prairie potholes, North 
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Stewart, R.E. & H.A. Kantrud, 1973. Ecological distribution of breeding 
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Turner, M.M.G., 1985. Ecological effects of multiple perturbations on a 
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United States Department of Agriculture, 1982. National List of Scientific 
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Vermeer, J.G. & E Berendse, 1983. The relationship between nutrient 
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Walker, J.M., 1959. Vegetation studies on the Delta Marsh, Delta, 
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Walker, J.M. & R. T. Coupland, 1968. An analysis of vegetation-environment 
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Walker, J. M. & R.T. Coupland, 1970. Herbaceous wetland vegetation in 
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Ward. E., 1942. Phragmites management. Trans. N. Am. Wildl. conf. 
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Ward, P., 1968. Fire in relation to waterfowl habitat of the Delta 
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