Irish Texts Society OP01: Foclóir Gaedhilge Agus Béarla: An Irish-English Dictionary

Irish Texts Society OP02: Father Dinneen - His Dictionary and the Gaelic Revival

Irish Texts Society OP03: Foras Feasa ar Éirinn: History of Ireland

Irish Texts Society OP04: A New Introduction to the Bardic Poems of Tadhg Dall Ó hUiginn (1550-1591)

Irish Texts Society OP05: Foclóir Stairiúil Áitainmneacha na Gaeilge: Historical Dictionary of Gaelic Placenames

Irish Texts Society OP06: Foclóir Stairiúil Áitainmneacha na Gaeilge: Historical Dictionary of Gaelic Placenames