I learned the core foundation of my technique from the Simandl method
books and went through the Streicher books for working on upper
register technique. I've worked on Nanny excerpts but never gone though
the whole thing. I found the Streicher books to be very thorough and
methodical about thumb position playing, but incredibly dry. I found
some good bowing exercises in the Nanny books. I see them all as
complimentary for the most part. That's all I could say right now -
anything in particular you're looking for?