What Sandman and Gargoyle said: highly recommended.

Be aware that the book is written for the 10-hole diatonic harmonica (often referred to as blues harp) in Paddy-Richter-tuning, a variant of the standard Richter tuning. Since there is only one note changed the tunes can be played on a standard harmonica but will sound better on a Paddy-Richter (in a session with loud instruments you might not hear the difference).

Best wishes
Ernest