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http://www.linuxjournal.com/node/8438/print
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http://en.wikipedia.org/wiki/Piranha_solution#Preparation
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http://members.optusnet.com.au/%7Eeseychell/PCB/etching_CuCl/index.html
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http://geda.seul.org/docs/current/tutorials/gsch2pcb/tutorial.html
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