Oriģināls: Belwin Master Duets. A proven source of graded duets for both the student and teacher of brass and woodwind instruments. Trombone.
Tulkojums: Trombons. , Volume 2. Keith Snell. Trombonu notis. Sākums. Trombons. , Volume 2. Viegli. Sastāvā Keith Snell.