According to: http://imslp.org/wiki/List_of_compositions_by_Sergey_Taneyev , this work, while written in 1879-80, wasn't published during Taneyev's lifetime, indeed, not until 1956, and so doesn't have an opus number. There seem to be a lot of works of his in that category.
Thanks for pointing this piece out: I'm always on the lookout for new (to me) string trios!
No opus number, as far as I can tell.
According to: http://imslp.org/wiki/List_of_compositions_by_Sergey_Taneyev , this work, while written in 1879-80, wasn't published during Taneyev's lifetime, indeed, not until 1956, and so doesn't have an opus number. There seem to be a lot of works of his in that category.
Thanks for pointing this piece out: I'm always on the lookout for new (to me) string trios!