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2012
Photojojo Captcha Feb 14, 2012
2009
CAPTCHAs' Effect on Conversion Rates Jul 24, 2009
Interaction-Design.org Tickmark Captcha Apr 6, 2009
2008
Photoshop Express Captcha Apr 3, 2008
Capzles Captcha Apr 3, 2008
Drupal Captcha Feb 7, 2008
Oranges Contact Form Jan 30, 2008
2007
Yahoo! Registration Nov 27, 2007
Google Registration Nov 27, 2007
Digg Captcha Nov 27, 2007

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