Sorry for the morbid subject line and I hope this plea for assistance is posted in the correct forum since it will have an effect on copyright. I'm in the process of transferring some of Joseph Marx's scores from the Internet Archive to the US server but have run into a dead end trying to find the death dates for 2 translators, a librettist, and an arranger. It is probably unlikely they outlived Marx (d. 1964) but you never know. The authority records and the regular sources I check produced nothing. Any information you can provide would be greatly appreciated. Here they are.
1. Addie Funk. Translator of Barcarole for High Voice and Orchestra (1910). Also translated the text in Mahler's 4th symphony.
2. G.W. Pursey. Translator of Du bist der Garten (1916). Also provided translations of works by Mahler, Dvořák, Kodály, etc.
3. R. Graf. Provided the text for Marx's Der Gefangene (1917) and Ein goldenes Kettlein (1917) and several others.
4. Gustav Binder. Arranged the vocal score for Marx's Herbstchor an Pan (1911).