Columbia subject headings:
Harvard subject headings:
Derry (Northern Ireland)--History--20th century--Pictorial works.
Derry (Northern Ireland)--History--20th century.
Derry (Northern Ireland)--History--Pictorial works.
Princeton subject headings:
Derry (Northern Ireland)--History--20th century--Pictorial works.
Derry (Northern Ireland)--History--20th century.