Its unknown why the past owner decided he needed to store a phone directory in his fallout shelter
“I bet your list knows why!”
I have many, save every large phone book. A relative looked under a sink in a bathroom in my house, saw stacked phone books and said, “We can throw these away.” I said, “Toilet Paper”. He rolled his eyes and shut the cabinet door.
Keep a bucket of bleach water nearby to sanitize it.
But that's just me.
/johnny
LOL. In the 37 years I have lived in this house, I have never thrown away a single phonebook.LOL