Columbia subject headings:
German literature--History and criticism.
Mineralogy in literature.
Minerals in literature.
Nature in literature.
Harvard subject headings:
German literature--18th century--History and criticism
Mineralogy in literature.
Mines and mineral resources in literature.
Romanticism--Germany
Princeton subject headings:
German literature--18th century--History and criticism.
Mineralogy in literature.
Mines and mineral resources in literature.
Romanticism--Germany.