Wikipedia: Irish Republican Army
Describes the different paramilitary organizations known as the IRA from the 1920s to 1969.
Wikipedia: Provisional Irish Republican Army
Profile of the group commonly known today as the IRA that conducted a paramilitary campaign against British rule in Northern Ireland from 1970 until renouncing violence in 2005.
BBC News: Provisional IRA
Covers the development of modern Irish republicanism, including archive footage of key moments of the Troubles, from 1969 to 2005.
Provisional IRA: War, Ceasefire, Endgame?
Chronological history of the group from its emergence in 1969 to on-going attempts at decommissioning in 2002. From BBC News Online.