Columbia subject headings:
Chopin, Frédéric, 1810-1849.
Composers--Biography.
Potocka, Delfina, hrabina, 1807?-1877.
Harvard subject headings:
Chopin, Frédéric, 1810-1849
Composers--Biography
Potocka, Delfina, hrabina, 1807?-1877.
Princeton subject headings: