Columbia subject headings:
Chemistry--Germany.
Chemistry.
Liebig, Justus, Freiherr von, 1803-1873.
Wöhler, Friedrich, 1800-1882.
Harvard subject headings:
Chemistry
Liebig, Justus, Freiherr von, 1803-1873.
Wöhler, Friedrich, 1800-1882.
Princeton subject headings: