Essential Exercises for the Chromatic Harmonica book by James Hughes.
Used diligently, these exercises will help develop technique, endurance, analytical thinking, memorising ability and improvisational skills.
Book 1 first edition approx 190 pages. The exercises in book 1 provide study material using scales, modes and intervals in the 12 major keys. All exercises start on hole 1 and continue through to the top octave, ensuring the whole instrument is covered whichever key is being used.
This book is in notation only so the ability to read music is essential.