Columbia subject headings:
Dramatists, Irish--20th century--Biography--Indexes.
O'Casey, Sean, 1880-1964--Dictionaries.
Harvard subject headings:
Dramatists, Irish--20th century--Biography--Indexes.
O'Casey, Sean, 1880-1964--Dictionaries, indexes, etc.
Princeton subject headings:
Dramatists, Irish--20th century--Biography--Indexes.
O'Casey, Sean, 1880-1964--Indexes.