Catalogue of Solo and Chamber Music for Viola da Gamba

D-W, Cod. Guelf. 34.7 Aug.2° (Jakob Ludwig Partitur Buch), n° 50, p. 79-80 (Sign: Schampon)

In D-W, the second instrument is referred to simply as "Viola" in the title, but both in the musical text – to signal an error of the layout – and in the index it is specified as "Viola di gamba".
The same sonata is found anonymously in F-Pn Rés Vm7 673 Rost , n. 45, with the title A 2 Violino, è Viola . Here, some passages in the low register of the viola da gamba part are transposed an octave higher, thus the resulting range (d-c'') corresponds to that of a viola da braccio.

http://vdgs.org.uk/thematic/Z.pdf

Michael Fuerst, The Partiturbuch Ludwig: An Introduction and Thematic Catalogue, «The Viola da Gamba Society Journal», 4 (2010), pp. 74-102. http://vdgs.org.uk/journal/Vol-04.pdf