References

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Barss, K (2007). The history of skyscrapers: a race to the top. Retrieved on the 24^th of August 2009, from http://www.infoplease.com/spot/skyscraperhistory.html

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Victorian Curriculum Assessment Authority. (2008). Mathematics. Retrieved on the 22^nd of August, 2009 from: http://vels.vcaa.vic.edu.au/essential/discipline/mathematics/index.html