Elma Doflein & Erich Doflein 
The Doflein Method [PDF ebook] 
The Violinist’s Progress. The second and third positions

Chapter 1: The third position – Chapter 2: Combining the 3rd and 1st positions – Chapter 3: Further practice in shifting from the 1st to the 3rd position – Chapter 4: Application of the third position – Chapter 5: Harmonics – Chapter 6: The second position – Chapter 7: Combining the 2nd and 1st positions – Chapter 8: Minor keys. More difficult studies – Chapter 9: Combining the 2nd and 3rd position – Chapter 10: The half position