I must check my Rust "Victor Master Book" later when I return home. I think there is an entry of a session with Hurt and Robinson doing a duet, which was REJECTED, around 1928 or 1929. I am only now recalling this. It was not recorded for Brunswick, and not for Columbia. It could also be in JR under "Robinson", or the Complete Entertainment Discography under "Robinson" (or the name of their duo), but this is something I need to do to corroborate whether or not any of this has any relevancy.