History of Graph theory

	Revision 6 . . November 22, 2001 12:16 pm by Goochelaar [+connected, +tree]
	Revision 5 . . November 19, 2001 6:39 pm by Goochelaar [added some details]
	Revision 4 . . September 30, 2001 10:56 am by BlckKnght [link to node article (which maybe should be more general?), fixed ascii art formating]

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