The collection comprises 255 books. Languages in the collection include English and Gaelic Irish. The collection was formed from items acquired by the Library at the time of original publication. The collection includes items from The Candle Press and The Three Candles Press, both connected to Ó Lochlainn.
Colm Ó Lochlainn (1892-1972) established the Candle Press in 1916 and it was the winner of a bronze medal for bookbinding in 1924. Ó Lochlainn founded At the Sign of the Three Candles Press in 1926. The press published Irish literature, works about Irish art and matters about Ireland. Ó Lochlainn gave the aspiring piper Seamus Ennis his first job at the Three Candles Press and Ennis collaborated with Ó Lochlainn on the Irish Street Ballads books. He succeeded Seamus Ó Casaide as volunteer editor of Irish Book Lover in 1930. Ó Lochlainn was an assistant in the Faculty of Modern Irish at University College Dublin from 1933-1943 later becoming professor of Irish Language and Literature.