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http://www.techlib.com/science/ion.html
http://www.techlib.com/science/ionchamber.htm
http://www.hardhack.org.au/book/export/html/44
Great ideas for Claudia's next science fair project!
Posted by: Fred | March 29, 2011 at 09:30 PM
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Great ideas for Claudia's next science fair project!
Posted by: Fred | March 29, 2011 at 09:30 PM