Can any college level or above tuba player recommend a good advanced studies boo

Question:

Can any college level or above tuba player recommend a good advanced studies book.?

I have finished the Rubanks and Tyrell books.

Best Answer - Chosen by Asker: well keep practicing from rubanks. umm. theres the Arbans method book, and Clarke studies. they work well with euphoniums and trombone, if you can read it down an octave it'll be great for you.. and there IS an edition of arbans for bass cleff. i have it. theres actually 2. one from mark fisher and one form encore music