Columbia subject headings:
Harvard subject headings:
Czech drama--20th century--History and criticism--Congresses.
Czech drama--20th century--History and criticism.
Czechs--Foreign countries.
Ethnic theater--English-speaking countries--History--20th century--Congresses.
Ethnic theater--North America--History--20th century--Congresses.
Slovak drama--20th century--History and criticism--Congresses.
Slovak drama--20th century--History and criticism.
Slovaks--Foreign countries.
Princeton subject headings:
Czech drama--20th century--History and criticism--Congresses.
Ethnic theater--English-speaking countries--History--20th century--Congresses.
Ethnic theater--North America--History--20th century--Congresses.
Slovak drama--20th century--History and criticism--Congresses.