You must read "The Great Irish Potatoe Famine" by Donnely, the definitive tome.
And, while definitely not about the troubles, but very funny/interesting/informative - everything really - fiction.
http://en.wikipedia.org/wiki/Edith_Anna_Somerville
And for a modern laugh... "The Irish Country Doctor" by Patrick Taylor.
Sadly I don't think the Taylor works are digitised yet, but the Sommerville & Ross are on Gutenberg, and I don't know about the Donnelly - but it deserves a place on the shelf for anyone interested in Irish history.