Yeah this is a strange way to define "banned books". I would think Hustler has to be universally "banned" in all US schools, it has to be in the top 10 most banned books. Or maybe because it's a magazine Hustler doesn't count so the author left it out...
The only books I can think of that are actually banned, as in it's against the law to obtain, in the US would be like a B2 bomber capability manual or some other classified documentation.
But if they don't carry it, it can't have been removed from the libraries, and therefore couldn't qualify for this list. Weird insight into someone's mind that they would bring up Hustler in a discussion about school libraries.
The only books I can think of that are actually banned, as in it's against the law to obtain, in the US would be like a B2 bomber capability manual or some other classified documentation.