Columbia subject headings:
Harvard subject headings:
Children with mental disabilities--Education--Germany--History--20th century--Congresses.
Euthanasia--Germany--History--20th century--Congresses.
Germany--Social conditions--1933-1945--Congresses.
Involuntary sterilization--Germany--History--20th century--Congresses.
People with mental disabilities--Germany--History--20th century--Congresses.
Princeton subject headings:
Euthanasia--Germany--History--20th century--Congresses.
Involuntary sterilization--Germany--History--20th century--Congresses.
People with disabilities--Germany--History--20th century--Congresses.