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Sunday, January 27, 2008
PLC Web Sites
Mr. PLC - http://www.mrplc.com/
History of the PLC - http://www.barn.org/FILES/historyofplc.html
Free PLC Book - http://claymore.engineer.gvsu.edu/~jackh/books/plcs/
PLC Open Home - http://www.plcopen.org/