Columbia subject headings:
Chopin, Frédéric, 1810-1849--Manuscripts--Facsimiles.
Music--Manuscripts--Facsimiles.
Musical sketches.
Harvard subject headings:
Chopin, Frédéric, 1810-1849--Manuscripts--Facsimiles.
Music--Manuscripts--Facsimiles.
Musical sketches
Princeton subject headings:
Chopin, Frédéric, 1810-1849--Manuscripts--Facsimiles.
Music--Manuscripts--Facsimiles.
Musical sketches.
Sonatas.