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Keeping Time Through the Ages : the History of Tools used to Measure Time
Janey Levy Rev. ed.. Rosen, 2010 書
The Silk Road : Using A Map Scale to Measure Distances
Janey Levy 1st ed.. Rosen, 2005 書
Breaking the Code with Cryptography : Analyzing Patterns
Janey Levy 1st ed.. Rosen, 2006 書
The Great Pyramid of Giza : Measuring Lenght, Area, Volume, and Angles
