||Microfilm no.3-025 from Guatemala collection
According to Grove Music, this is a Villancico that is for 2 voices. Although they don't mention a continuo part, the extant part has numbers on it, and says "Acom'to al Duo". The page has therefore been tagged as "2vv bc". Unfortunately, only one part seems to be extant, so the tag may need to be revisited if more is discovered.