A Complete Reference to Over 7,000 Chords
By Chad Johnson
Published by Hal Leonard
A lifeline if you're struggling to get your head around chords in alternative tunings: Open G, Drop D, DADGAD (the 'Celtic' tuning, AKA Dsus4) and many others!
From the publisher
An alternate tuning is created when one or more strings of the guitar are tuned to notes that differ from standard tuning. This book is designed to familiarize you with chord shapes while playing in some of the most common alternate tunings, such as: Open D, Open G, Open Gm, Open A, Open E, Open Em, Open C, Drop D, Double Drop D, Dsus4 and more. Includes info on chord construction, and easy-to-read diagrams.