Columbia subject headings:
Harvard subject headings:
Germany--History--1933-1945--Exhibitions.
Immigrants--Germany--Ruhr (Region)--History--Exhibitions.
Immigrants--Germany--Ruhr (Region)--Social conditions--Exhibitions.
Jews--Germany--History--1933-1945--Exhibitions.
Jews--Germany--Migrations--Exhibitions.
National socialism--Germany--Ruhr (Region)
Refugees--Germany--Ruhr (Region)--History--Exhibitions.
Refugees--Germany--Ruhr (Region)--Social conditions--Exhibitions.
Ruhr (Germany : Region)--Emigration and immigration--History--Exhibitions.
Princeton subject headings:
Germany--History--1933-1945--Exhibitions.
Immigrants--Germany--Ruhr (Region)--History--Exhibitions.
Immigrants--Germany--Ruhr (Region)--Social conditions--Exhibitions.
Jews--Germany--History--1933-1945--Exhibitions.
Jews--Germany--Migrations--Exhibitions.
National socialism--Germany--Ruhr (Region).
Refugees--Germany--Ruhr (Region)--History--Exhibitions.
Refugees--Germany--Ruhr (Region)--Social conditions--Exhibitions.
Ruhr (Germany : Region)--Emigration and immigration--History--Exhibitions.