References

Batterbury, Simon.  GEOG 6402 Cultural Ecology and its critics.  1997.        

         http://www.colorado.edu/geography/courses/geog6402/ce.html

Carter, Janet Stein.  2001.   http://biology.clc.uc.edu/courses/bio303/history.htm

Environmental Canada.  Water and aquatic ecosystems.  2001. 

        http://www.ec.gc.ca/water/en/nature/aqua/e_init.htm