Data Entry for a dentist e-mailing list

I have an excel spreadsheet with 6440 California Dentistis. I have some of the information already like name, address. What I am looking for is for someone to add the following fields to this list. 1. Email Address; 2. Phone Number; 3. Website. You will need to search the web dentist directory sites like droogle, google, [login to view URL] and you will also need to search [login to view URL], etc. to look for the dentists. In some cases wheere a dentist cannot be found, you can list this in the spreadsheet as "Not Found". These dentists are not always easy to find. The goal of this project is to find as many of the denstists on this list as possible. ACCURACY IS VERY IMPORTANT.