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Tech Directions. Apr2006, Vol. 65 Issue 9, p19-21. 3p.
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Tech Directions. Apr2004, Vol. 63 Issue 9, p33-36. 4p. 3 Color Photographs.
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Tech Directions. Sep2007, Vol. 67 Issue 2, p29-31. 3p. 1 Black and White Photograph, 2 Diagrams, 1 Chart, 1 Graph.
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Tech Directions. May2003, Vol. 62 Issue 10, p17. 3p. 2 Color Photographs, 2 Black and White Photographs, 2 Graphs.
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Tech Directions. Aug2007, Vol. 67 Issue 1, p25-26. 2p. 5 Illustrations, 2 Charts.
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Tech Directions. Apr2007, Vol. 66 Issue 9, p36-34. 2p.
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Tech Directions. Aug2011, Vol. 71 Issue 1, p13-14. 2p. 5 Color Photographs.
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