As shown on the Dave Swinger Blogger blog, "South" was actually available on single records for at least 70 years, until RCA stopping making vinyl records (later on 45: RCA Victor 47-2956 c/w Bunny Berigan's "Frankie And Johnnie", and 447-0880 c/w Earl Hines' "Boogie Woogie On The Saint Louis Blues" in the Gold Standard Series).
According to its cat# this very successful record (reissued on Victor 24893 in April 1935 and available on RCA Victor with that cat# until the mid-1950s) was not released in 1928 (as originally submitted) but in February 1929. Mike Gann, owner of John Bolig's Victor Black Label Discography: 22000, 23000, 24000, V-38000, V-38500 and V-40000 Series, can you help with the accurate day (apparently 8 or 22)?
Anyway this is another proof for the bizzare dates in Joel Whitburn's Pop Memories 1890-1954 book, who lists January 26, 1929 as this record's entry in the not yet existing US pop charts, i.e. before it was actually released.
Edit: Found it myself over there, apparently added by our own xiphophilos: "Both sides were originally released on February 22, 1929 as Victor V-38021."
So I have edited the release date here accordingly.