First Studies for Viola, Op. 86, by Richard Hofmann. Includes 20 studies to practice different elements of viola technique, from strength and flexibility of the left hand to bowing and articulation. 

15 Studies Op. 68 for 2 Violas (Instrumental Duet)

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12 Studies for Viola (Instrumental Solo)

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41 Caprices Op.22 for Solo Viola (Instrumental Solo)

Bartolommeo Campagnoli, Carl Herrmann

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