Columbia subject headings:
Harvard subject headings:
Euthanasia--Government policy--Germany--Langenfeld (North Rhine-Westphalia)--History--20th century--Sources.
Involuntary sterilization--Government policy--Germany--Langenfeld (North Rhine-Westphalia)--History--20th century--Sources.
National socialism.
People with disabilities--Institutional care--Government policy--Germany--Langenfeld (North Rhine-Westphalia)--History--20th century--Sources.
Rheinische Landesklinik Langenfeld--Archives.
Rheinische Landesklinik Langenfeld--Government policy--History--20th century--Sources.
Princeton subject headings:
Euthanasia--Government policy--Germany (West)--Langenfeld (North Rhine-Westphalia)--History--20th century--Sources.
Involuntary sterilization--Government policy--Germany (West)--Langenfeld (North Rhine-Westphalia)--History--20th century--Sources.
National socialism.
People with disabilities--Institutional care--Government policy--Germany (West)--Langenfeld (North Rhine-Westphalia)--History--20th century--Sources.
Rheinische Landesklinik Langenfeld--Archives.
Rheinische Landesklinik Langenfeld--Government policy--History--20th century--Sources.