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http://bluehen.ags.udel.edu/udbg/dean/garden.html
http://bcc.orst.edu/hortpm/227hweb.htm
http://www.mpelectric.com/treebook/scientific.html
http://www.lib.uconn.edu/vol4/CANR/plsci/mbrand/a/a.html
http://www.orst.edu/instruct/for241/
http://www.rook.org/earl/bwca/nature/flora.html
http://www.planetpets.simplenet.com/treecnfr.htm
http://willow.ncfes.umn.edu/silvics_manual/Table_of_contents.htm
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