Such a list would be redundant in the Internet age. Anybody can conjure up such a list on the Net in less time than it would take to pick up your car keys and walk out to the car port.
Should libraries have a list of books that are banned?
NO. It shouldn't be mandatory to have a list and banned books can be found all over the internet.
See, now I'm looking to see which books are banned :D
Banned by who??
no.
