Columbia subject headings:
Harvard subject headings:
Ireland--Politics and government--19th century.
Ireland--Politics and government--20th century.
Protestants--Northern Ireland
Ulster (Northern Ireland and Ireland)--Politics and government.
Princeton subject headings:
Ireland--Politics and governmant--20th century.
Ireland--Politics and government--19th century.
Protestants--Northern Ireland.
Ulster (Northern Ireland and Ireland)--Politics and government.