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In keeping with the purpose of this forum...
You're most likely going to have to invest some money to get this information.
Here's what I would do.
1. contact the phone company for the area you're interested in
2. purchase an electronic version of the white/yellow pages
3. write a program that would cross reference every possible phone number and denote the unreferenced numbers.
The resulting list would consist of unlisted and dead numbers. This is a very simple thing to do, however, it will cost you. Also, if you write the program correctly, you could easily integrate it into an automated phone dialing system.
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"The gift of liberty is like that of a horse, handsome, strong, and high-spirited. In some it arouses a wish to ride; in many others, on the contrary, it increases the desire to walk."
-- Massimo d'Azeglio
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