Bluestown was a Boston based label (believe it or not) run by a guy nicknamed Skippy White who had a record store there - it may still be in business, for all I know.
Guitar Nubbit was another artist on the Bluestown label. His records are worth hearing too. Wolf Records issued a CD, Bluestown Story Volume 1, which contains all of Alabama Watson's and Guitar Nubbit's released sides plus some unreleased material. I don't see it listed on Amazon, so perhaps it's almost as rare as the 45's.
Trix was a label run by Pete Lowry, who did a lot of field recordings and who lived in my neck of the woods. Pete has since moved to Australia.
edit: According to Ron Bartolucci's liner notes to the Wolf CD, Alabama Watson was a customer in Skippy White's record store, mentioned that he played and sang blues, and ended up recording.
Also, according to the same liner notes, Guitar Nubbit (Alvin Hankerson) was a barber who had a shop close to Skippy White's. He used to play guitar in his shop and ended up recording.
The McKinley James 45 (I have a copy somewhere in my garage) was recorded in 1966 in Macon in your home state, Jeff.