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http://www.preservenet.com/freeways/FreewaysCheong gye.html
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http://www.globalrestorationnetwork.org/uploads/fi les/LiteratureAttachments/270_restoring-cheonggyec heon-stream-in-the-downtown-seoul.pdf
http://www.env.go.jp/earth/coop/neac/neac13/sessio n2/261-281.pdf
http://www.mip.org.my/forms/Presentation.pdf
http://www.nytimes.com/2009/07/17/world/asia/17daylight.html?pagewanted=1&_r=4
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http://www.preservenet.com/freeways/FreewaysCheong
http://www.city.minato.tokyo.jp/kurasi/kankyo/kang
http://www.hydroasia.org/jahia/webdav/site/hydroas
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http://www.env.go.jp/earth/coop/neac/neac13/sessio
http://www.mip.org.my/forms/Presentation.pdf
http://www.nytimes.com/2009/07/17/world/asia/17daylight.html?pagewanted=1&_r=4