Originally Posted by Dr.Epic
Those could all be books written after the Great Mushroom War.
True, but i don't know why you would jump to that conclusion... i mean if VHS tapes(along with numerous other relics) survived then i don't see why books wouldn't have. Not to mention an interesting detail about the library is that its buried partly underground and thus actually evidence that the building itself might pre-date the mushroom war
And besides... From this episode, we know of at least one other book that we know for sure that pre-dates the mushroom war