You somehow managed to get into O5-10 (The Archivist)'s Library. There would be many bookshelves with files on the SCP Foundation's personnel, SCPs, Groups of Interest, and a lot of other things of the sort. Be careful though, if you don't have high enough clearance, there might be a memetic hazard.....or you might get caught. You'll most likely not get caught though, because O5-10 isn't currently in the Library.