The Modern Records Centre at the University of Warwick Library has digitised a selection of photographs, booklets, postcards and reports relating to the Easter Rising, Irish War for Independence and Irish Civil War. The collection is free to view here:
(Tip: Some reports, or booklets, many contain many pages. When you click on a report use the thumbnails on the right to view all available pages)
Above, a partial grab of a postcard from the collection, titled 'The Sinn Fein Revolt in Dublin. The Ruins of Liberty Hall.'