There is a 2 volume CD set released recently of Max Hunter himself singing some of the songs. By scannin the Missouri Folklore Society web site, you might get an insight into even more Ozark material. Many of the people involved in Ozark music and writing are members of the society---Gordon McCann for one, and Ellen Gray Massey, the founder and editor of the Bittersweet magazine for another. The Missouri Folklore Society publishes some great books with much material about all sorts of interesting things. The web site can guide you to their acquisition.
                                  A proud member