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From:  Factal - Quantum - Macro - Cosmos


Links

Google:          "leonardo" "secret codes"  
gives 12_400



  http://unmuseum.mus.pa.us/leocode.htm

http://www.unmuseum.org/wonders.htm

http://chloepaintings.blogspot.com/2007/05/secret-codes-and-ye-olde-melancholic.html


http://www.karentate.com/Tours%20target%20fans%20of%20the%20Code.pdf