A graded list of flute etude books available on Petrucci: college level

In my last post I shared links for etude books that are on Petrucci and appropriate for middle and high school level students (roughly ages 12-17).  Here's what I've found for college level students:



Etudes - College

Altes 26 Selected Studies
Boehm Op. 37  & Op. 26
DeLorenzo 9 Studies
Demersseman Op. 4
Donjon 8 Etudes de Salon
Dothel Flute Studies
Furstenau Op. 15
Furstenau Op. 107
Gariboldi Op. 139
Hugues Op. 75
Karg-Elert Op. 107
Kohler Op. 33
Kohler op. 75
Kummer Op. 110
Kummer Op. 129
Popp Flute School Op. 205 (vol. 2)

(Also available on Petrucci: Andersens Op. 15, 21, 30, 33, 37, 41, 60, 63)