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