Another source, not for the particular song mentioned, but for lots of others is BALLADS AND SONGS COLLECTED BY THE MISSOURI FOLKLORE SOCIETY. It was edited by H.M. Belden, and published by the U of MO Press, sometime in the 40s. It was reprinted in the 60s, but I don't know if it's still around now. Try the ALIBRIS website for out of print and hard to find books.