Favorite intermediate/advanced study books

[Merlin]

I'm spending a lot of time on the Polatschek studies lately. Most of them are based around motifs from well known classical works, but modulated through several keys. It's sort of like a jazz patterns kind of treatment, where you learn a lick in every key.

[Gandalfe]

Where'd you find this material; is it something I can buy online?

[Merlin]

Where'd you find this material; is it something I can buy online?

I should give you the correct title:

Advanced Studies for the Clarinet by Victor Polatschek

G. Schirmer/Hal Leonard 50328230