The secret life of libraries

From The Guardian -

"In the 60s, before the Lady Chatterley trial," says Ian Stringer, "you used to get block books – literally, wooden blocks in place of any books the librarians thought were a bit risqué, like Last Exit to Brooklyn. You had to bring the block to the counter and then they'd give you the book from under the desk. So of course you got a certain type of person just going round looking for the wooden blocks."