Columbia subject headings:
Harvard subject headings:
Abnormalities, Human--History--20th century.
Disabilities--Germany--History--20th century.
Germany--Moral conditions--20th century.
Mental illness--History--20th century.
Moral conditions--History--20th century.
Social norms--Germany--History--20th century.
Social norms--History--20th century.
Violence--Social aspects--History--20th century.
Princeton subject headings:
Abnormalities, Human--History--20th century.
Disabilities--Germany--History--20th century.
Germany--Moral conditions--20th century.
Mental illness--History--20th century.
Moral conditions--History--20th century.
Social norms--Germany--History--20th century.
Social norms--History--20th century.
Violence--Social aspects--History--20th century.