Banjo Chords Book by Mel Bay's
 
This handy book shows all of the basic banjo chords in photo and diagram form. The front of the book contains a section of bluegrass G-tuning chords, and the remainder contains C-tuning.
 
In All Keys:
Major
Minor
7th
Diminished
Augmented
6th
Minor 6th
7th #5
7th b5
Major 7th
Minor 7th