Yes, this is all very nice stuff (a lot of which I already had). I'd also be willing to fill in a few gaps, such as the Feinberg (spelled correctly!) sonatas you are missing, for I've got a pretty large collection myself.
Hi,I have an extensive music score collection of my own, and wouldn't mind chipping in - e.g. mosolov/feinberg/roslavets other futurist composers. Just wondering, would any of you happen to know how I might be able to get Alexander Rosenblatt's works? In particular, the third piano sonata, but really I find his works fascinating, and have been trying to find them for a while now. I have quite a few of his scores already, (his paganini variations and second sonata) but am at a loss as to how to obtain his other works.