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Carl Fischer The Double Valve Bass Trombone Method: method for bass trombone with single valve in F, double valve in Eb, double valve in D and "Independent" 2nd valve in Gb, by Alan Raph, ISBN 9780825835841, ISMN 9790060064630, CF 4808, 23 x 30.5 cm, 72 pages, in English language
Carl Fischer The Double Valve Bass Trombone Method: metode til basbasun med enkelt ventil i F, dobbeltventil i Eb, dobbeltventil i D og "Independent" 2. ventil i Gb, af Alan Raph, ISBN 9780825835841, ISMN 9790060064630, 30 cm, 30 cm, 20 cm. sider på engelsk