Columbia subject headings:
Goethe, Johann Wolfgang von, 1749-1832--Knowledge and learning.
Humboldt, Alexander von, 1769-1859.
Morphology.
Science.
Harvard subject headings:
Goethe, Johann Wolfgang von, 1749-1832--Knowledge--Science.
Humboldt, Alexander von, 1769-1859.
Morphology
Princeton subject headings:
Goethe, Johann Wolfgang von, 1749-1832--Knowledge--Science.
Humboldt, Alexander von, 1769-1859.
Morphology.