Here are the other links I found:

Lead Belly - Whoa Back Buck - Version #1

Lead Belly - Whoa Back Buck - Version #2

Lead Belly - Whoa Back Buck - Version #4

Lead Belly - Whoa Back Buck (Ox Drivin' Blues) - Version #6

These were all that I could come up with. If anyone out there would like to try their hand at tracking down the others, be my guest.

Jay