Franz Wohlfahrt - 60 Studies, Op. 45 Complete

I use this volume all the time, especially with adult students and older children. Irma great for teaching how to handle the bow and the fingers. I generally introduce it in Suzuki book 3, though with one student I started a few measures at a time while in book two.

One tip:
It is not always necessary for most of the pieces to force a student to learn perfectly the entire thing...sometimes I assign a few lines and make sure the basic concept has been learned, then move on to another. My teacher did require each piece to be learned perfectly, but in tandem with Suzuki, I have found that often this book parallels quite nicely, and to be quibbling over tone in a piece meant for bowing technique can defeat the purpose of using this book to aid and assist the regular material.