Complete Method (all levels)
Baker, Buddy Tenor Trombone Method -- Includes all scales with correct alternate positions, tonguing, slurring, breathing, multiple tonguing
Beginning Methods
Bordner, Gerald. First Book of Practical Studies
Voxman. Selected Duets, Vol.1
Intermediate Methods
Bordogni. Trans. Rochut Melodious Etudes Book I
*Voxman. Selected Studies for the Trombone
Fink. Introducing the Tenor Clef
*Fink. Advanced Musical Etudes
Advanced Methods
Couillaud. Thirty Etudes Modernes
Fink. Introducing the Alto Clef
Uber. Virtuoso Clef Studies
Bordogni. Melodious Etudes Book II
*Texas All-State etudes usually come from these method book.