Works Cited


Berner, Elizabeth Kay and Robert A. Berner.  The Global Water Cycle:  Geochemistry and  

	Environment.  Englewood Cliffs, N.J.:  Prentice-Hall, Inc., 1987.



Kirk, Paul W., Jr. The Great Dismal Swamp.  Charlottesville, Va.:  University Press of 

        Virginia, 1979.





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