I've been corresponding with Gerhard Braas in Hamburg who is helping John Sheahan's son archive all the Dubliners material they can find. You could try him at this address:
Gerhard.braas@hamburg-mannheimer.de or you could PM him as I "met" him on Mudcat. His mudcat name is samundcandy.
Post back if you find a source. There are probably a few of us would loke to get a copy of that one.