Such evidence as I have is from Worldcat and a check of a couple of libraries connected to it, but will check Hofmeister MB also (only available up to 1947, but useful for 1921 and 1924 when I have a bit of time).daphnis wrote:Copyright consideration for Canada/EU is a moot point as these regions are based on a life plus term. For the US, only the date of publication is the factor, and in this regard the piano version is completely separate from the orchestral score. If what you say is true, then the piano score would be free but orchestral score would not be.
The piano reduction was done by Bela Balazs (or in the original, Balazs Bela - still omitting diacritics...) (1884-1949) near as I can tell. See eg sample piano score link.
For the full score see eg most useful full score link (at Ithaca College the permanent link is this which also provides the UE plate number that the Worldcat page does not). A by-date ordering on Worldcat (bartok 13 holzgeschnitzte) turns up this as the first in date order of appearance for full scores fwiw. (The search "bartok fából faragott" gives a similar result: 70-page vocal scores from 1921 up to a certain point, then 269 - page scores from 1924 begin appearing, only a few of them; then ones with copyright dates of 1949 - poss. real new editions, poss. copyfraud - after that.)