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       References 
         
      Merritts, D., DeWet, A., Menking, K. (1998). Environmental Geology: An Earth System Science Approach. W.H. Freeman and Company. New York, NY. 
       
      Schlesinger, W. H. (1991). Biogeochemistry: An Analysis of Global Change. Academic Press, Inc., New York, NY. 
       
      Purves, W. K., Orians, G. H., Heller, H. C. (1995). Life: The Science of Biology. Fourth edition. Sinauer Associates, Inc., Sunderland, MA. 
       
      Smith, R. L. (1990). Ecology and Field Biology. Fourth edition. Harper Collins Publishers, Inc., New York, NY. 
       
      
      
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