Strangely, 20 years ago very few people thought that their name in the phone book was a privacy concern. A few people got unlisted numbers but that was generally because they were public figures to one degree or another and wanted to avoid nuisance calls.

This was a concern for most professionals. If you were a physician, lawyer, dentist, etc you did this because you didn't want patients/clients looking you up at home. My father, who is a physician, did this and refuses to open an FB account for the same reason.

In "Steve Jobs: The Lost Interview" (which is great), Jobs mentions that when he was twelve he needed some computer parts and looked up Bill Hewlett in the phone book and called him at home. Hewlett picked up, Jobs got the parts and a job at HP (summer job?). Maybe people used to respect other peoples time more and having a listed number was not a big problem.