I just happened across this one Tim Jumper - banjo tutor book.. The reviewers at the bottom of the page seem to have found it useful when switching from guitar.
He also is responsible for a Tim Jumper - banjo songbook. The songbook is mostly arranged for clawhammes style, not bluegrass, and the music is in the form of TAB (tablature) for banjo.
Quack!
GtD.