Urals Folk Chorus, Po Polju

I'm learning Po Polju (youtube link, Kitka), a Russian song. I have an ecstatic memory of being bathed in sound as Kitka walked in singing this song at the beginning of a concert, something like 25 years ago.

Kitka learned it via the Urals Folk Chorus, so I went looking for a source recording online. I didn't find Po Polju, but did find this whole album someone uploaded to youtube. It's beautiful!

State Ural Russian Folk Choir - very old record, Side 1, 8 minutes
The comments are actually good, people chatting about the album and posting song lyrics.

State Ural Russian Folk Choir - very old record, Side 2, 9 minutes
Someone found that it's from 1959