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• Stock.xchng - http://sxc.hu/
• List - http://blueblots.com/freebies/25-sites-to-download-free-royalty-stock-photo-and-textures/
• MorgueFile - http://www.morguefile.com/
• Corbis - http://www.corbis.com
• iStockphoto - http://www.istockphoto.com