Trying to find out more info about the Boehm scores...
Do they have a copyright notice or a date of publication somewhere? Who is the editor, and can you Google them and see if they are still around or still under copyright?
I'm seeing what looks like a new release of the Billaudot version under the recent "French Flutists Propose" series. (ed. by Robert Hériché).
Better check that it hasn't been renewed, and whether the editor is still under copyright. I tried to google Robert Hériché and got very little, but then, I do not speak French.
Costallat became part of Billaudot after 1950, so perhaps the two editions are the same.
PM me if you like, so that this thread can get back on track.
I would love to see more music on the new IMSLP by flute people, such as Quantz, Devienne, Blavet, King Friedrich II the Great, Boehm, Doppler, etc. etc.
“all great composers wrote music that could be described as ‘heavenly’; but others have to take you there. In Schubert’s music you hear the very first notes, and you know that you’re there already.” - Steven Isserlis