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Barnes, P. W., and A. T. Harrison.  1982.  Species distribution and community 
     organization in a Nebraska Sandhills mixed prairie as influenced by 
     plant/soil-water relations. Oecologia 52:192-201.

Barnes, P. W., A. T. Harrison, and S. P. Heinisch.  1984.  Vegetation patterns 
     in relation to topography and edaphic variation in Nebraska Sandhills 
     prairie. Prairie Nat. 16:145-158.

Barnes, P. W., L. L. Tieszen, and D. J. Ode.  1983.  Distribution, production,
     and diversity of C3 and C4-dominated communities in a mixed prairie. 
     Can. J. Bot. 61:741-751.

Bragg, T. B.  1978.  Effects of burning, cattle grazing, and topography on 
     vegetation of the 	choppy sands range site in the Nebraska Sandhills 
     Prairie. Pp. 248-253 in Proc. First Int. 	Rangeland Cong. 
     (D. N. Hyder, ed.). Denver, CO.

Bragg, T. B.  1998.  Fire in the Nebraska Sandhills Prairie. Pp. 179-194 in Fire 
     in ecosystem management: shifting the paradigm from suppression to 
     prescription. Tall Timbers Fire Ecol. Conf. Proc. (T. L. Pruden and L. A. 
     Brennan, eds.).  No. 20. Tall Timbers Res. Sta. Tallahassee, FL. 

Burzlaff, D. F.  1962.  A soil and vegetation inventory and analysis of three 
     Nebraska sandhills range sites. Nebr. Agr. Exp. Sta. Res. Bull 206. 
     Lincoln, NE.

Daubenmire, R. F.  1968.  Plant communities: a textbook of plant synecology.  
     Harper and Row, New York, NY.

Day, P. R.  1965.  Particle fractionation and particle-size analysis. Pp. 96-99 
     in Methods of soil analysis. Amer. Soc. Agron., Inc. (C.A. Black, ed.). 
     Madison, WI. 

Doliner, L. H., and P. A. Jolliffe.  1979.  Ecological evidence concerning the 
     adaptive significance of the C4 dicarboxylic acid pathway of photosynthesis.  
     Oecologia 38:23-34.

Frolik, A. L., and W. O. Shepherd.  1940.  Vegetation composition and grazing 
     capacity of a typical area of Nebraska Sandhill rangeland. Nebr. Agric. 
     Exp. Sta. Res. Bull. 117. 	Lincoln, NE.

Humphrey, R. R.  1962.  Range ecology. The Ronald Press Company, New York, NY.

Kaul, R.  1998.  Plants. Pp. 127-142 in An atlas of the Sand Hills (A. Bleed 
     and C. Flowerday, eds.). Conservation and Survey Division, University of 
     Nebraska, Lincoln, NE.

Mueller-Dombois, D., and H. Ellenberg.  1974.  Aims and methods of vegetation 
     ecology. John Wiley & Sons, New York, NY.

NOAA.  1998.  Climatological data annual summary: Nebraska. National Climate 
     Data Center, Ashville, NC.

Pool, R. J.  1914.  A study of the vegetation of the sandhills of Nebraska. 
     Minn. Bot. Studies 4:189-312.

SAS Institute.  1996.  SAS/STAT user's guide, Volume 1 and 2, Version 6.12 ed. 
     SAS Inst., Cary, NC.

Schulte, E. E.  1988.  Recommended soil organic matter tests. Pp. 29-32 in 
     Recommended chemical soil test procedures for the North Central Region 
     (W.C. Dahnke, ed.). North Central Regional Pub. No. 221, North Dakota 
     State University, Fargo, N.D.

Steel, R. G. D., and J. H. Torrie. 1980. Principles and procedures of 
     statistics: a biometrical approach. 2nd ed. McGraw-Hill, New York, NY.

Stubbendieck, J., and P. E. Reece. 1992.  Nebraska handbook of range management.
     Cooperative Extension Service, Inst. of Agr. Natural Resources. University 
     of Nebraska, EC 92-124-E, Lincoln, NE.

Tolstead, W.L. 1942. Vegetation of the northern part of Cherry County, Nebraska. 
     Ecol. Monogr. 12:255-292.

Weaver, J. E. 1920. Root development in the grassland formation. Carnegie Inst., 
     Pub. 292. 	Washington, D.C.

Weaver, J. E.  1954.  A seventeen-year study of plant succession in prairie. 
     Am. J. Bot. 41:31-38.

Weaver, J. E., and F. W. Albertson.  1939.  Major changes in grassland as a 
     result of continued drought. Bot. Gazette. 100:576-591.