Discovering Geometry http://www.keypress.com/product_info/dg.html
The Geometer's Sketchopad http://www.keypress.com/sketchpad/index.html
Brain Builders published by Playmore Inc. Publishers and Waldman Publishing Corp. Copyright date 1986.
Giant Book of Math Fun and
Giant Book of Puzzles both published by Sterling Publishing Co. Copyright
date is 1998.
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