Cyril Scott and Florent Schmitt

[esoterica]

I am working on recording projects of the complete piano music of British composer Cyril Scott, and French composer Florent Schmitt.  As both composers wrote prolifically for the piano, these are large-scale projects that will take a few years.
I am missing a few scores, and wonder if anyone happens to own copies of this long out-of-print material.  I can't find any of them in library catalogs (other than the British Library & Library of Congress), or even order archival copies from the owners of the copyright.
Of Schmitt, I still need:
       Op.29, Neuf pieces
       Op.12, Deux pieces
       Op.13, Trois petites pieces (Trois morceaux)
       Op.37/2, Gavotte (solo pf version)
       Op.19/1, Chanson a bercer (duet version)
Of Scott, I still need:
        Trois danses tristes (Schott)
        Dagobah (Forsyth)
        Three frivolous pieces (Forsyth)
        Two piano pieces (Boosey)
        Britain's war march (Schott)
        Butterfly waltz/Valse des papillons (Schott)
        Carillon (Schott)
        Chinese serenade (Forsyth)
        Dorothy waltz (West)
        Guttersnipe's dance (Schott)
        Irish reel (Elkin)
        Toy-box (Schott)
Can anyone help me out?  Most of these works were published between 1895 and 1920, and have been out of print since.          
Many thanks.