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Izvornik
12 Etuden. Tuba sheet music. 12 Etuden composed by Heinrich Gugel. Edited by Fatch. For tuba. Level 3-4. Sheet music. Published by Friedrich Hofmeister Musikverlag. HF.FH-6075. ISBN M-2034-6075-6.
Prijevod
12 Etuden. Tuba note. 12 Etuden sastoji Heinrich Gugel. Uredio Fatch. Za Tuba. Razina 3-4. Note. Objavljeno Friedrich Hofmeister Musikverlag. HF.FH-6075. ISBN M-2034-6075-6.