References

 

 

Cafferty, S. 2005. Firefly Encyclopedia of Trees. The Brown Reference Group, Buffalo, New York, USA.

 

Grimm, W.C. 1970. Home Guide To Trees, Shrubs, and Wild Flowers. The Stackpole Company, Harrisburg,

     Pennsylvania, USA.

 

Hora, B. 1981. The Oxford Encyclopedia of Trees of the World. Oxford University Press, Oxford, England.

 

Preston, R.J. and R.R. Braham. 2002. North American Trees: Fifth Edition.  A Blackwell Publishing Company, Ames,

     Iowa, USA.

 

Cottonwood 2005. <http://tolweb.org/magnoliids>.  Accessed 31 March 2010.

 

Cottonwood Tree 2006.  <http://www.kshs.org/teachers/trunks/pdfs/symb_jtree.pdf>.

 

Kansas Forests 2008. <http://www.kansasforests.org/conservation/deciduous/cottonwoods.html>.  Accessed 10

     April 2010.

 

UConn Plant Database 1997. <http://www.hort.uconn.edu/plants/p/popdel/all.html>.  Accessed 31 March 2010.

 

United States Department of Agriculture: Plant Database 2010. <http://plants.usda.gov.index.html>.  Accessed 22

     March 2010.

 

USDA Forest Service 2010. <http://www.fs.fed.us/database/feis/plants/tree/popdel/all.html>.

 

 

 

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