How many public schools have banned Huckleberry Finn?

The book Huckleberry Finn has been banned by many school boards and removed from the shelves of libraries.

The earliest banning was in 1885 at Concord, Mass. The Public Library banned the year-old book for its "coarse language" - this refers to the use of what is now called "the n Word" more than 200 times throughout the book. In 1905, the Brooklyn Public Library followed Concord's lead, banishing the book from the building's juvenile section, explaining: "Huck not only itched but scratched, and that he said sweat when he should have said perspiration."

It is periodically banned for similar reasons.