One use for a phone book was to prop a little kid in a regular chair so they could eat at the table. Like, after they outgrew a baby highchair and could balance on their own. Also you could prove your strength by ripping one in half.
Listings were usually under the name of the adult male, for safety as well as sexism. A woman living alone would probably use just her initials for safety.
I’d like to see it lead to some personnel changes at the agency, because that’s where cultural change starts