I wonder if any of my readers have access to the following book: The hymns of Saint Hilary of Poitiers in the Codex Aretinus; an edition, with introduction, translation and notes, W.N.Myers, Philadelphia, 1928. It’s 82 pages long.
Worldcat gives a long list of US universities that hold this volume. So it’s not that rare. It’s almost certainly out of copyright. But I can’t get access to a copy where I am at the moment.
If you have access, and might be willing to copy the thing for me, please write to me using the blog contact form, which is here. I’d be happy to pay any reasonable expenses.