347 Studies for Trombone by Various. Arranged by Eva Perenyi, Peter Perenyi, , and P. For Trombone. EMB. 88 pages. Editio Musica Budapest #Z14452. Published by Editio Musica Budapest (HL.50486166).
This collection of easy to intermediate level studies are drawn from etudes and excerpts by many composers. In progressive order, the studies carefully expand the range of notes and positions. A trombone student could play from this huge collection for several years.