Bloody Sunday, Derry, Northern Ireland, 1972 2 Demonstrations -- Northern Ireland -- Derry -- History -- 20th century 2 Derry (Northern Ireland) -- History Political violence -- Northern Ireland -- Derry -- History -- 20th century 2 Derry (Northern Ireland) -- Social conditions 1 Massacres -- Northern Ireland -- Derry -- History -- 20th century 1 Post-traumatic stress disorder -- Northern Ireland -- Derry 1 יותר ... פחות ...