I learned with Ch. Demaele's method, available on this site, and then with this Médard Ferrero method. The problem with these methods is the fingerings: they are written with 4 fingers of the right hand, without the thumb. Modern teaching uses the thumb right from the start. In my opinion, the methods of Astier and Baselli or Manu Maugain are more up to date: use of the thumb from the start. They too come in several volumes. Thank you for this volume by Médard Ferrero; I had bought it in its current edition, and it's always good to have it in electronic form.