Columbia subject headings:
Northern Ireland--Economic conditions--Congresses.
Northern Ireland--Rural conditions--Congresses.
Northern Ireland--Social conditions--1969---Congresses.
Harvard subject headings:
Northern Ireland--Economic conditions--Congresses.
Northern Ireland--Rural conditions--Congresses.
Northern Ireland--Social conditions--1969---Congresses.
Princeton subject headings:
Northern Ireland--Economic conditions--Congresses.
Northern Ireland--Rural conditions--Congresses.
Northern Ireland--Social conditions--1969---Congresses.