It's a performance by the Conchord trio from England on a CD released by Black Box records. The CD also contains recordings of Book 1 of the Makrokosmos and A Little Suite For Christmas.
The production still isn't great, but it's far better than the Ludwig Van piece I did earlier. You can download it here (30MB mp3 file, ~21:00 playing time).
Thanks to KFJC for allowing me to post it here.
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