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http://education.nationalgeographic.com/encyclopedia/hydroelectric-energy/
https://www.nwcouncil.org/history/GrandCouleeHistory
http://www.usbr.gov/lc/hooverdam/faqs/powerfaq.html
http://geocurrents.info/wp-content/uploads/2012/07/Electricity-from-Hydro-Map.jpg
http://www.infrastructureusa.org/great-american-infrastructure-grand-coulee-dam/
https://upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Dinorwig_Power_Station.jpg/800px-Dinorwig_Power_Station.jpg
http://www.usbr.gov/pn/grandcoulee/pubs/factsheet.pdf
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https://rayblessed.files.wordpress.com/2013/12/hydro-power-8.jpg
http://www.chinahighlights.com/yichang/attraction/three-gorges-dam.htm
http://news.nationalgeographic.com/news/2006/06/060609-gorges-dam_2.html
https://adailychallenge.files.wordpress.com/2010/11/lake-vyrnwy.jpg