I'm looking for a source where I can download all business telephone listings (yellow pages) in the USA. Does anyone know where I might find such a data set?
Ideally, I'd like to be able to get historical listings also.
Update/Clarification I'm really looking for business names & geographic location. Telephone directories seem like a convenient place to get this information, but I don't actually need phone numbers. Any data set that contains business names and addresses (really just ZIP code would be enough) would be sufficient.