Columbia subject headings:
Harvard subject headings:
Eugenics--Germany--History--20th century--Sources.
Euthanasia--Germany--History--20th century--Sources.
National socialism--History--Sources.
National socialism--Sources.
Princeton subject headings:
Eugenics--Germany--History--20th century--Sources.
Euthanasia--Germany--History--20th century--Sources.
Killing of the mentally ill--History--20th century--Sources.
National socialism--History--Sources.