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Source:
Tech Directions. Aug2008, Vol. 68 Issue 1, p16-19. 4p. 4 Diagrams.
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Education Digest; Dec2017, Vol. 86 Issue 4, p43-51, 9p
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Tech Directions; August 2001, Vol. 61 Issue 1, p27-29, 3p
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Education Digest; May2018, Vol. 83 Issue 9, p51-53, 3p
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Tech Directions; Oct2017, Vol. 77 Issue 2, p27-29, 3p, 1 Graph
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Education Digest; Dec2011, Vol. 77 Issue 4, p43-49, 7p
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Education Digest. Sep90, Vol. 56 Issue 1, p45-49. 5p.
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Tech Directions. Jan2003, Vol. 62 Issue 6, p11. 1p. 1 Color Photograph, 1 Black and White Photograph, 6 Diagrams.
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Tech Directions; Oct2018, Vol. 78 Issue 2, p30-11, 2p, 1 Black and White Photograph
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