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.
OP, don’t try to do this yourself. If you think you can handle the process without a professional, that’s fine, but you’re going to need at least one strong friend to help you move all that glass out carefully and hold it straight and still when you’re putting it back and gluing it. They’ll need patience as well, because no beers until it’s all done!