Name this Book

When this book first came out, it was only read by a handful of rather wealthy people. Now almost everyone has a copy, and many people read it regularly. You cannot buy it from a bookstore or borrow it from the library. Can you name this book? Click below for the answer.

It's a phone book.

This is a good example of an old riddle that has not aged well, so don't feel bad if you found it a bit tricky. Newer technology has rendered phone books practically useless, yet I still get one delivered to my house every year. In another generation or so, many people might not know what they were used for.