Modern Architecture

http://askville.amazon.com/Biblical-times-homes-flat-roofs-water-rained/AnswerViewer.do?requestId=578764

https://en.wikipedia.org/wiki/Flat_roof

http://www.bbc.com/news/world-middle-east-14437334

http://www.discoverychannel.com.au/images/the-history-of-skyscrapers/

http://gurumagazine.org/askaguru/skyscrapers-fall-heavy-wind/

http://science.howstuffworks.com/engineering/structural/skyscraper4.htm

https://en.wikipedia.org/wiki/Tube_%28structure%29

http://www.infoplease.com/spot/skyscraperhistory.html

Kompasianival

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