Columbia subject headings:
Harvard subject headings:
Euthanasia--Austria--Vienna--History--20th century--Congresses.
Medical ethics--Austria--History--20th century--Congresses.
National socialism and medicine--Congresses.
Princeton subject headings:
Euthanasia--Austria--Vienna--History--20th century--Congresses.
National socialism--Austria--Vienna--History--20th century--Congresses.