Robert,

I cannot give a complete list of reasons school boards have used for banning
HUCKLEBERRY FINN; but THE MARK TWAIN JOURNAL published an interesting issue
for the Fall of 1984 (Volume 22, Number 2) in which a number of black
writers
looked at the novel a hundred years after its completion.  Thadious Davis,
in his introduction to the issue, takes up the subject of the book's being
banned and indicates that the contributing writers have discussed it in
the accompanying essays.  T

As I recall, the most popular reason among those in the mid-twentieth
century
who have asked that the book be banned was its use of the word "nigger" and
its depicting Jim as a subservient being.

The JOURNAL presents a number of ancillary reasons as well.

Good luck in your search.

David Tomlinson