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Belcher, J.W. and S.D. Wilson.  1989.  Leafy spurge and the species composition 
     of a mixed-grass prairie.  J. Range Manage. 42:172-175.

Brinkman, M.  1997.  Reproductive status of established black dot flea beetle 
     (Aphthona nigriscutis) populations in South and North Dakota.  Leafy 
     Spurge News 19:2.

Daubenmire, R.  1959.  A canopy-coverage method of vegetational analysis.  
     Northwest Sci.  33:43-64.

Dowdy, S. and S. Weardon. 1983.  Statistics for research.  John Wiley and Sons, 
     Inc.  New York, N.Y.

Hanson, H.C. and V.E. Rudd. 1933.  Leafy spurge life history and habits.  N.D. 
     Agr. Exp. Sta. Bull. 266. 

Higgins, K.F., A.D. Kruse, and J.L. Piehl. 1989. Prescribed burning guidelines 
     in the northern Great Plains.  USFWS and Coop. Ext. Serv., S. Dak. State 
     Univ., USDA EC760.

Messersmith, C.G. and R.G. Lym. 1983.  Distribution and economic impacts of 
     leafy spurge in North Dakota.  N.D. Farm Res. 40:8-13.

Milliken, G.A. and D.E. Johnson. 1984. Analysis of messy data, Vol. 1: designed 
     experiments.  Van Nostrand Reinhold, New York, NY. 

Rees, N.E. and N.R. Spencer.  1991.  Biological control of leafy spurge, p. 182-
     192.  In: L.F. James, J.O. Evans, M.H. Ralphs, and R.D. Child [eds], 
     Noxious Range Weeds.  Westview Press.  Boulder, CO.

SAS Institute, Inc. 1989a. SAS/STAT user's guide, version 6, 4th ed., Vol. 1.  
     SAS Institute, Inc.  Cary, N.C.

SAS Institute, Inc. 1989b. SAS/STAT user's guide, version 6, 4th ed., Vol. 2.  
     SAS Institute, Inc.  Cary, N.C.

Selleck, G.W., R.T. Coupland, and C. Frankton. 1962. Leafy spurge in 
     Saskatchewan.  Ecol. Monog. 32:1-28.

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

Trammell, M.A. and J.L. Butler.  1995.  Effects of exotic plants on native 
     ungulate use of habitat.  J. Wildl. Manage. 59:808-816. 

Wallace, N.M., J.A. Leitch, and F.L. Leistritz.  1992.  Economic impact of 
     leafy spurge on North Dakota Wildland.  Ag. Econ. Rep. 281, Agric. Exp. 
     Sta., N.D. State Univ. Fargo, N.D. 

Watson, A.K.  1985.  Introduction: the leafy spurge problem, p. 1-6 In: A.K. 
     Watson, (ed.) Leafy Spurge.  Weed Sci. Soc Amer. Monogr. 3.
 
Wolters, G.L., C. Hull Sieg, A.J. Bjugstad, and F.R. Gartner.  1994.  Herbicide 
     and fire effects on leafy spurge density and germination.  USDA, USFS, 
     Rocky Mountain Forest and Range Exp. Sta. Res. Note RM-526. 5pp.