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1.  Guth, A. R. and Cohen, S. B. (1989) Red skies of '88: the 1988 forest fire 
         season in the northern Rockies, the northern Great Plains and the 
         Greater Yellowstone Area.  Pictorial Histories Publ. Co., Missoula, MT.

2.  Johnson, W. W. and Saunders, H. O. (1977) Chemical forest fire retardants:
         acute toxicity to five freshwater fishes and a scud.  Tech. Paper #91, 
         U.S.Forest Service.

3.  Larson, J. R. and Duncan, D. A. (1982) Annual grassland response to fire 
         retardant and wildfire.  J. Range Manage. 35,700-703.

4.  Ansul Fire Protection. (1994) Material safety data sheet: Silv-Ex.  Ansul 
         Fire Protection, One Stanton St., Marinette, WI.

5.  NWCG Fire Equipment Working Team. (1991) Field quality control of fire 
         retardant chemicals.  Boise Interagency Fire Center, Publ. NFES 1245.

6.  Lyons, J. W. (1970) The chemistry and uses of fire retardants.  
         Wiley-Interscience, New York.

7.  Milliken, G. A. and Johnson, D. E. (1984) Analysis of messy data, 
         volume I: designed experiments.  New York, NY: Van Nostrand Reinhold Co.

8.  Steel, R. G. D. and Torrie, J. H. (1980) Principles and procedures of 
         statistics.  A biometrical approach, 2nd edition.  New York, NY., 
         McGraw-Hill, Inc.

9.  SAS Institute Inc. (1989) SAS/STAT user's guide. Version 6, fourth edition, 
         volume 2.  Cary, NC: SAS Institute Inc.

10. Zedler, J. and Loucks, O. L. (1969) Differential burning response of Poa 
         pratensis fields and Andropogon scoparius prairies in central Wisconsin.  
         Am. Midl. Nat. 81,341-352.