Columbia subject headings:
Irish wit and humor, Pictorial.
Northern Ireland--History--Pictorial works.
Northern Ireland--History.
Northern Ireland--Politics and government--Caricatures and cartoons.
Northern Ireland--Politics and government.
Postcards--Northern Ireland--History.
Harvard subject headings:
Irish wit and humor, Pictorial.
Northern Ireland--History--Pictorial works.
Northern Ireland--History.
Northern Ireland--Politics and government--Caricatures and cartoons.
Northern Ireland--Politics and government.
Postcards--Northern Ireland--History.
Princeton subject headings:
Northern Ireland--Politics and government.
Postcards--Northern Ireland.