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Österreichische Nationalbibliothek, Vienna (A-Wn): EM.72.c
||Trio Sonata in C minor, ÖNB EM.72.c
||Sonata à due
||violin, cello, continuo (see below)
The A-Wn source mentions "viola" instead of cello. As the rest of the collection is for cello and this does not fit the range of the viola, this must also be for cello. ONB site lists it as a Sonata for violin, cello and continuo.