I never went to the Suess part of the park when I was there, and Suess isn't that well known in the UK at all. We have gotten my son a few Suess books, but would probably visit that part of the park on a future visit. But that already has made the leap to classic; potter has yet to actually achieve that.
Over the years there's been tons of book series that have been major popular, take the entire Terry Pratchett Discworld series; it takes a lot for these books to be passed along. I never knew the LOTR story until i saw the movies and it still confuses the hell out of me (because some parts just don't make sense), most kids i think see Wizard of Oz because it's shown every christmas; thats how i saw Star Wars the first few times as well (it was ALWAYS shown on xmas eve). And in this ever changing world, there can be a huge difference between what is successfully passed on and what doesn't make the generational bridge.
Is someone really going to read an encyclopedia? surely all the information is probably on the internet already anyway. Sounds like something that would go on a shelf next to "Teach yourself Klingon" (I didn't get very far).
Personally, I think I'll stick to passing down G1 Transformers and Disney; and when he's old enough I'll tell him to read Imzahdi. I only read Star Trek books so there won't be much in the way of literature passed down.