Columbia subject headings:
Harvard subject headings:
Anxiety in literature--Congresses.
Civilization, Medieval--Congresses
German literature--21st century--History and criticism--Congresses.
Nature conservation--Congresses
Phobias in literature--Congresses.
Princeton subject headings:
Interdisciplinary approach in education--Congresses.
Knowledge, Theory of--History--Congresses.
Nature and civilization--Congresses.
Nature--Effect of human beings on--Congresses.