Citations

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• http://dir.yahoo.com/recreation/automotive/
• http://dir.yahoo.com/entertainment/movies
• http://dir.yahoo.com/recreation/outdoors/
• http://dir.yahoo.com/arts/visual
• http://dir.yahoo.com/computers
• http://dir.google.com/top/recreation/autos/
• http://dir.google.com/top/arts/movies/
• http://dir.google.com/top/recreation/outdoors/
• http://dir.google.com/top/arts/photography/
• http://dir.google.com/top/computers/software/
• http://www.amazon.com
• http://infomap.stanford.edu/