Columbia subject headings:
Beethoven, Ludwig van, 1770-1827. Symphonies, no. 1, op. 21,
Harvard subject headings:
Beethoven, Ludwig van, 1770-1827. Symphonies, no. 1, op. 21,
Princeton subject headings:
Beethoven, Ludwig van, 1770-1827. Symphony, no. 1, op. 21, C major.