- [Copy of a] letter from Éamonn Ceannt to an unnamed recipient replying to an allegation that Ceannt must have been aware of the existence of another song of the same name as his "Ireland over all", with copy of Ceannt's lyrics, undated.
- Blank Christmas card from Patrick Lyons, Bishop of Kilmore, undated.
- Card [to Kathleen O'Brennan] from Aine Ceannt and Rónán Ceannt, undated.
- Card from Alice Stopford Green to Lily O'Brennan concerning arrangements to meet, undated.
- Card from Jack B. Yeats to Lily O'Brennan wishing her a happy Christmas and New Year, undated.
- Christmas card from Alice Milligan to Lily O'Brennan enclosing Irish Red Cross subscription and cheque for exhibition catalogue, undated.
- Christmas card from Jack and Lottie [Elizabeth] Yeats including an image of flowers and Christmas greetings, undated.
- Christmas card from Patrick Lyons, Bishop of Kilmore to Áine Ceannt wishing her, Rónán and Lily a happy Christmas, undated.
- Christmas card from W[illiam] Power with Celtic illustrations and greetings in English and Irish, undated.
- Copy typescript letter from Rónán Ceannt and other unidentified members of the Law Agent's Office of the Dublin Corporation to the Secretary of the Department of Local Government regarding their opposition to the appointment of a new position within the office, undated.
- Fragment of letter, undated.
- Invitation to a meeting for the Irish White Cross, Committee for the Maintenance of Orphans from the Secretary, Áine Ceannt, undated.
- Letter [to Kathleen O'Brennan] from Radio Éireann provisionally agreeing to Kathleen O'Brennan's broadcast on Saturday 16th May [1942], undated.
- Letter from Alice Milligan [to Lily O'Brennan?] concerning a letter she has received from Risteárd Mác Mael Cuta, undated.
- Letter from Alice Milligan concerning a lost handbag, undated.
- Letter from Alice Milligan to "friends" concerning personal and family news, [June 7].
- Letter from Alice Milligan to Áine Ceannt asking for accomodation when she goes to Dublin for an "A.E Memorial Committee" meeting and informing her about the plight of "Michael", regarding his military service and possible financial relief, undated.
- Letter from Alice Milligan to Áine Ceannt concerning a job application and her 'Arbour Hill' poem, undated.
- Letter from Alice Milligan to Áine Ceannt concerning a Seán MacDiarmada anecdote and lack of transport, undated.
- Letter from Alice Milligan to Áine Ceannt concerning errors in a previous note and the exchange rate between dollars and pounds, undated.
- Letter from Alice Milligan to Áine Ceannt concerning mention in a radio broadcast, undated.
- Letter from Alice Milligan to Áine Ceannt regarding an article about Napoleon's charity during his pursuit of Sir John Moore to be published in the Red Cross Journal, undated.
- Letter from Alice Milligan to Lily O'Brennan "or sister" concerning a lost handbag, undated.
- Letter from Alice Milligan to Lily O'Brennan "or sister" concerning tickets to a dinner party, undated.
- Letter from Alice Milligan to Lily O'Brennan and Áine Ceannt concerning a visit to a grave, undated.
- Letter from Alice Milligan to Lily O'Brennan and sisters concerning members of the Gaelic League, undated.
- Letter from Alice Milligan to Lily O'Brennan and sisters concerning the death of her brother, Seaton Milligan, undated.
- Letter from Alice Milligan to Lily O'Brennan concerning a book and a dress, undated.
- Letter from Alice Milligan to Lily O'Brennan concerning a dinner engagement and receipt of a book, undated.
- Letter from Alice Milligan to Lily O'Brennan concerning a meeting of the Belfast Anti-Partition Committee, undated.
- Letter from Alice Milligan to Lily O'Brennan concerning a new house and the Irish P.E.N. Club, undated.
- Letter from Alice Milligan to Lily O'Brennan concerning a poem about the men of the Easter Rising, undated.
- Letter from Alice Milligan to Lily O'Brennan concerning a visit to Dublin and a meeting, undated.
- Letter from Alice Milligan to Lily O'Brennan concerning a visit to Dublin and the death of Mr. Dobbins, undated.
- Letter from Alice Milligan to Lily O'Brennan concerning a visit to Seumas Dobbin, undated.
- Letter from Alice Milligan to Lily O'Brennan concerning a young student and old friends, undated.
- Letter from Alice Milligan to Lily O'Brennan concerning an incident with the Post Office, undated.
- Letter from Alice Milligan to Lily O'Brennan concerning an upcoming party, a new boiler and her poetry, undated.
- Letter from Alice Milligan to Lily O'Brennan concerning articles she has written and a house she would like to rent, undated.
- Letter from Alice Milligan to Lily O'Brennan concerning attendance at a meeting, undated.
- Letter from Alice Milligan to Lily O'Brennan concerning Éamonn Ceannt, Maude Gonne and donkey riding, undated.
- Letter from Alice Milligan to Lily O'Brennan concerning friends and family, undated.
- Letter from Alice Milligan to Lily O'Brennan concerning her 'Arbour Hill Poem', undated.
- Letter from Alice Milligan to Lily O'Brennan concerning her 'Arbour Hill Poem', undated.
- Letter from Alice Milligan to Lily O'Brennan concerning her journey home and shopping, [August 30].
- Letter from Alice Milligan to Lily O'Brennan concerning her news and reflections, undated.
- Letter from Alice Milligan to Lily O'Brennan concerning her poetry and prose, undated.
- Letter from Alice Milligan to Lily O'Brennan concerning her recent illness and desire to visit friends, [1936?]
- Letter from Alice Milligan to Lily O'Brennan concerning her recent poetry, undated.
- Letter from Alice Milligan to Lily O'Brennan concerning her travel experience, undated.
- Letter from Alice Milligan to Lily O'Brennan concerning her upcoming broadcast and recent visits, undated.
- Letter from Alice Milligan to Lily O'Brennan concerning her upcoming trip to Belfast, undated.
- Letter from Alice Milligan to Lily O'Brennan concerning her visit to Dublin Castle, undated.
- Letter from Alice Milligan to Lily O'Brennan concerning her writing, undated.
- Letter from Alice Milligan to Lily O'Brennan concerning old friends, undated.
- Letter from Alice Milligan to Lily O'Brennan concerning personal matters and events in Northern Ireland, [1946?].
- Letter from Alice Milligan to Lily O'Brennan concerning poetry, encounters with old friends, Kathleen O'Brennan's broadcast on Seumas O'Sullivan and praise for Ronán Ceannt, undated.
- Letter from Alice Milligan to Lily O'Brennan concerning Ronán Ceannt, her plans to visit and her poetry, undated.
- Letter from Alice Milligan to Lily O'Brennan concerning the death of her housekeeper's husband, undated.
- Letter from Alice Milligan to Lily O'Brennan concerning the deaths of Eva Gore-Booth and Maggie Johnston, undated.
- Letter from Alice Milligan to Lily O'Brennan concerning the sale of a gold watch and her recent writing, undated.
- Letter from Alice Milligan to Lily O'Brennan concerning the sale of a gold watch, undated.
- Letter from Alice Milligan to Lily O'Brennan concerning upcoming visits and meetings with friends, undated.
- Letter from Alice Milligan to Lily O'Brennan concerning visits and other news, undated.
- Letter from Alice Milligan to Lily O'Brennan, Áine Ceannt "and friends" concerning her brother's recent stroke, undated.
- Letter from Alice Milligan to Lily O'Brennan, Áine Ceannt and Ronán Ceannt concerning her desire to move house, undated.
- Letter from Alice Milligan to Mrs [Áine] Ceannt sending a contribution for the Irish Red Cross (Indian Famine) and discussing articles from the 'The Nineteenth Century Review' in 1878 related to charitable donations, undated.
- Letter from Brother Pacificus to Lily O'Brennan concerning her play, undated.
- Letter from Dora Shorter to Lily O'Brennnan concerning poetry and memories of the Easter Rising, [1916-1918?]
- Letter from Edwin M. Lloyd to Éamonn Ceannt seeking assistance regarding an excursion, undated.
- Letter from Eva Gore-Booth to Rónán Kent [Ceannt] thanking him for a card on her sister's behalf, undated.
- Letter from Kathleen Fox to Lily O'Brennan concerning Alice Milligan, [Dec 3].
- Letter from Maire B. Uí Brolchain to Áine Ceannt concerned so few members of Cumann na mBan are recording their memories, undated.
- Letter from Maire B. Uí Brolchain to Áine Ceannt encouraging her to record her memories of Éamonn Ceannt, the Easter Rising and Cumann na mBan, undated.
- Letter from Maire Walker to Lily O'Brennan praising her play for children, undated.
- Letter from Margaret Pearse to Mrs. Kent [Áine Ceannt] hoping she and Rónán enjoy their holiday, expressing how she misses her and describing her busy workload, [August 2].
- Letter from Minnie Milligan to Lily O'Brennan concerning a photograph of Alice Milligan, and the death of Seaton Milligan, undated.
- Letter from Mrs Lula H. Rupel to the Editor of the 'Oregonian' newspaper in protest at Kathleen O'Brennan not being allowed to speak in a venue, undated.
- Letter from Ronán Ceannt to Lily O'Brennan concerning practical jokes and a cinema catalogue, [1921?]
- Letter from Sarah Purser to Lily O'Brennan concerning Wilhelmina Margaret, undated.
- Letter from Séumas MacMaghnuis [Seumas MacManus] to Lily O'Brennan requesting an article on Ethna Carbery, [1915-1920?].
- Letter of introduction for Kathleen O'Brennan from [Mary] to William G. Sickel, undated.
- Letter of introduction for Kathleen O'Brennan from Sara Bard Field to [Cemas Prichat], undated.
- Letter of introduction for Kathleen O'Brennan from the Visitation Convent in St Paul, Minnesota to unspecified recipient, undated.
- Letter to Kathleen O'Brennan from Alice Milligan about a forthcoming honour, and about history and Kathleen O'Brennan's work on Napper Tandy, undated.
- Letter to Kathleen O'Brennan from Alice Milligan about a London court case, and about the harper O'Carolan and others, [19xx] Feb 2.
- Letter to Kathleen O'Brennan from Alice Milligan acknowledging receipt of money, and about poetry and historical figures, undated.
- Letter to Kathleen O'Brennan from an artist asking her advice about whether to exhibit paintings in Dublin at that time, [19xx] Sept 29.
- Letter to Kathleen O'Brennan from Lennox Robinson suggesting changes to a play written by Kathleen O'Brennan, undated.
- Letter to Kathleen O'Brennan from Linda Myra Harbeson about trying to arrange for Kathleen O'Brennan to give talks in Philadelphia, [19xx] May 21.
- Letter to Kathleen O'Brennan from Sara Allgood about the success of 'Juno and the Paycock' on the London stage and enclosing a newspaper cutting, undated.
- Letter to Mrs Mac Rae from Peter E. Magennis about work by the Women's Irish Education League, undated.
- Note from Alice Milligan [to Lily O'Brennan?] concerning arrangements to meet, undated.
- Note from Gerard Crofts to Master Ronan Kent [Rónán Ceannt] thanking Ceannt for his cards and for his remembrances of him which have touched Crofts deeply, undated.
- Note to Molly Childers from Katherine Leckie about Erskine Childers, undated.
- Notice from 'The Saturday Evening Post' to Lily O'Brennan concerning the unsuitability of her submitted works for publication, undated.
- Notice from J.J. Tierney of a visit by members of the Royal Society of Antiquaries of Ireland to the National Museum on the 17th of November 1945, undated.
- Notice from the Accounts Department of Browne & Nolan Ltd. to Lily O'Brennan, 1947 December.
- Photostat of letter from Éamonn Ceannt as Director of Communications of the Irish Volunteers outlining secure channels of communication within the Irish Volunteer postage service and requesting maps, names, addresses and details for messengers, undated.
- Pop up birthday card from "Paddy" to Mrs [Áine] Ceannt, undated.