I just came across this on Amazon.com:
It looks like a public domain "grey area" release, I think.
There are at least three in the series so far.
They are "Recorded to order" CD-Rs and I do not know the provenance, but there are anumber of alternate takes. They look like stripped back versions of the Chronological series to me.
And I just discovered a collection of 5 "Early Bing" albums on amazon which obviously include some nice alternate takes: