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http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/P/PlantTissues.h
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http://www.cas.muohio.edu/~meicenrd/anatomy/syllabus.html
http://bomi.ou.edu/bot4283/
http://www.biologie.uni-hamburg.de/b-
online/library/webb/BOT311/PlantCellWalls00/PCW00.htm