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"Rob's puzzle page: Edge Matching". Retrieved 2007-08-12. http://home.comcast.net/~stegmann/pattern.htm#edgematch
"Rob's puzzle page: Pattern Puzzles". Retrieved 2009-06-22. http://home.comcast.net/~stegmann/pattern.htm#em3d
"Kadon Enterprises, More About Edgematching". Retrieved 2009-06-22. http://www.gamepuzzles.com/moredge.htm