Essential Quick Charts for the Diatonic Harmonica by David Barrett gives you all of the important reference charts needed by all
Full diatonic harmonica key charts, bending charts, over-bend charts, position charts, major and minor scale charts, and Lee Oskar special tuning charts are covered.
The Mel Bay Gig Savers series has been designed to give studying harmonica players answers to common questions in a brief, affordable, yet informative fashion. This 16 page book is A5 size.
Sample page from the book.