Columbia subject headings:
Demonstrations--Northern Ireland--Derry.
Harvard subject headings:
Demonstrations--Northern Ireland--Derry--History--20th century.
Demonstrations--Northern Ireland--Derry.
Derry (Northern Ireland)--History--20th century.
Northern Ireland--Politics and government--1968-1998.
Violence--Northern Ireland--Derry--History--20th century.
Princeton subject headings:
Demonstrations--Northern Ireland--Londonderry--History--20th century.
Derry (Northern Ireland)--History--20th century.
Irish Republican Army.
Massacres--Northern Ireland--Londonderry--History--20th century.
Northern Ireland--History--1968-1998.
Political violence--Northern Ireland--Londonderry--History--20th century.