List:
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http://www.thomasnet.com/ pr7
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http://www.dmoz.org/ pr8
http://www.intute.ac.uk/socialsciences/ pr8
http://www1.lanic.utexas.edu/ pr8
http://www.ipl.org/ pr8
http://www.stumbleupon.com/ pr8
http://twitter.com/ pr9
http://www.usatoday.com/ pr8
http://www.directionsmag.com/ pr7
http://www.nytimes.com/ pr9
http://technorati.com/ pr8
http://www.reddit.com/ pr8
http://highwire.stanford.edu/ pr8
http://www.mysql.com/ pr9
http://pubs.acs.org/ pr8
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