Ian, there are lots of good books on the instrument. I, for one, have successfully stacked an entire set of Encyclopaedia Britanica atop an old Stella 5-string. And despite the fact that most banjo players are reputed to be unable to read, there are lots of good books about banjos, their history, how to play, regional styles and players, etc. Are you looking for any special topics, or just a general sense of what's out there that's worth looking at?