Regarding directory of web addresses

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Thanks to all the replies, let me explain what I'd like to find if it exist. A web site that when you put in the name of a company, person or whatever, it provides you with their website where you can find their contact info such as email etc. if they have one. Yell.com is good but I'm looking for the UNITED STATES only. Or a site that provides the email address of a company, person etc. Again that's to all who replied.