This includes ten open tunings, drop D, double drop D, Dsus4, open D, open G, Gm, A, E, Em, C and includes 30 common chords in two fret positions on a double page spread for each note in each tuning. The layout seems a bit random starting off with major and minor mixed on each page and variants of 7th dotted about. But having said that, their position is constant throughout the book (m11 always on last column on second row on second page). This is very clear and a good starting place to explore open tunings.
My first copy fell apart due to faulty binding but was quickly replaced by amazon.