Columbia subject headings:
Forests and forestry.
Goethe, Johann Wolfgang von, 1749-1832--Knowledge and learning.
Harvard subject headings:
Forests and forestry.
Goethe, Johann Wolfgang von, 1749-1832--Knowledge--Forests and forestry.
Princeton subject headings:
Forests and forestry.
Goethe, Johann Wolfgang von, 1749-1832--Knowledge--Forests and forestry.