So sorry for your reason to especially want Farewell, Angelina. I'm glad Dylan used " "Farewell to Tarwathie" and that Brian was able to point you to the correct original. I've been playing "Morning Has Broken" lately because it, too, is set to an old tune.
I had my ears perk up when you said 1955 for a cut-off date for Public Domain. That's presuming no extension was filed. (Also arrangements become a new composition.) I strongly recommend http://www.publicdomainsherpa.com/copyright-public-domain.html &, of course the group here. It's not a problem when playing for your own am aze ment, but performances can become tricky when you start getting out of the beginner category. With all the performances getting canceled or handled digitally, I'm grateful my historical storytelling stays in Public Domain. My new Prohibition program involves a <GASP!> ukulele. It will never be an instrument I love, but it's right for the era.