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Burrill, G., M. Clifford, and R. Scheaffer. Exploring Symbols: Data Driven Mathematics. White Plains, NY: Dale Seymour Publications, 1987.

Roizen, M. Real Age: Are You As Young As You Could Be?. Scranton, PA: Harper Collins, 2000.

The Guinness Book of World Records. New York: Bantam Books, 2000.

The World Almanac and Book of Facts 2000. Mahwah, NJ: World Almanac Books, 1999.

 

Ourside.com
www.ourside.com/age.html

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