Mary in Kentucky, I was hoping there was a way to reverse-engineer the midi! Thanks for taking the trouble.
If the e is e-natural, then the melody is G-dorian. Perhaps this represents the actual singing tradition.
In your own State of Kentucky, in the town of Benton, there meets every year the oldest continuously-meeting shape-note convention in the country (possibly on the planet). This convention uses the 1854 Southern Harmony. Have you ever been to the Benton "Big Singing" ?
T.