Hi, Graywolf - take a look at the Website of Yazoo Records. Kentucky Mountain Music is only one of many sets that are available. I started out trying to get all of them, but got swamped in CD's.
One thing - I wish the CD booklets had lyrics printed. The recordings have been nicely restored, but some are still hard to understand. Maybe that's something we listeners should do - click here to see what mustrad.org has done with Topic's Voice of the People series. Maybe we could annotate the Yazoo recordings in the same way. I'll do my best to put links in the list above if we have threads on any of the songs.
-Joe Offer-