Columbia subject headings:
Czechoslovakia--Emigration and immigration--History--20th century--Congresses.
Germany--Emigration and immigration--History--20th century--Congresses.
Refugees--Czechoslovakia--History--20th century--Congresses.
Refugees--Germany--History--20th century--Congresses.
Harvard subject headings:
Czechoslovakia--Emigration and immigration--History--20th century--Congresses.
Germany--Emigration and immigration--History--20th century--Congresses.
Refugees--Czechoslovakia--History--20th century--Congresses.
Refugees--Germany--History--20th century--Congresses.
Princeton subject headings:
Czechoslovakia--Emigration and immigration--History--20th century--Congresses.
Germany--Emigration and immigration--History--20th century--Congresses.
Refugees--Czechoslovakia--History--20th century--Congresses.
Refugees--Germany--History--20th century--Congresses.