Thanks, Kingley. It's tough to find these recordings, so every lil bit counts.
Aside from this the only recordings of Nat Riddles I've found are: 1) Gussow's street recording available through this site. 2) The TV inserts on Gussow's YouTube channel 3) The live track at the end of 'Live at Klingenthal' 4) A Larry Johnson track on an album called "American Folk Blues Festival" with Nat on harp
I made a tape recording of Nat playing "St. James Infirmary" just sitting around a friend's apartment down in Virginia. Incredible vibrato on a 64 Chromonica. I should dig that out of the closet.