User blog comment:XGlass Reflection/Ch. 54 Review~ Erwin of the Rebellion/@comment-41.233.21.171-20140212232735/@comment-179280-20140213033018

Not that the books didn't mention Titans. The books that were banned were only those that were explicitely about the outside world, but even those were still around. Armin's grandpa had one which Armin liked to read.