people always trot this out, but it was very possible to have your information unlisted so it was not printed in the book. you could also use a different name. an old coworker selected to have his name listed as David King so that when found in the book it would show up as King David.
having an unlisted number wasn't uncommon. for privacy minded people, it was a simple phone call to make it unlisted, and most just did it at time of getting the number.
nonetheless, pre-opting, your information was there, so anyone with a phonebook from before you made that decision would have your information. if an organisation had an interest in invading people's privacy it would not be complex to simply keep a copy of every edition of the phonebook
having an unlisted number wasn't uncommon. for privacy minded people, it was a simple phone call to make it unlisted, and most just did it at time of getting the number.