

Found this old bookshelf behind my grandpa's closet
So in our country, it’s a big tradition to build two houses on one property. You have a big "summer house" and a smaller one for the rest of the year. Today we went over to my grandparents' place, and I was hanging out in the big house just watching my little sister while she played.
After a bit, I went into the storage room. It’s basically just a place for useless junk we look at maybe once every five years, so absolutely nobody ever goes in there.
There were all these old closets in the room, and while I was looking around, I noticed this random gap between the closets and the wall. I ended up pushing the heavy closets out of the way a bit to squeeze behind them, and honestly I was not expecting to see THIS
Calling all book experts, are these actually rare or did I just find a bunch of old paper?