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School Mathematics Project. Shape Review Book. Cambridge, England: Cambridge University Press, 1991.

Winter, M., G. Lappan, E. Phillips, and W. Fitzgerald. Middle Grades Mathematics Project: Spatial Visualization. Menlo Park, CA: Addison-Wesley Publishing Company, 1986.

 

How a CT Scan Works
www.imaginis.com/ct-scan/how_ct.asp
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