[Letter from John O'Donovan to William Reeves, concerning the translation of the Culdei-celide De tract.]

[Letter from William Reeves (Parsonage House, Ballymena, Co. Antrim) to John O'Donovan, asking for assistance at translating an Irish text; O'Donovan's response, in which he comments on the current poverty, famine and unrest in Ireland.]

[Letter from John O'Donovan (8 Newcomen Place, North Strand, Dublin) to William Reeves, discussing extracts from Irish manuscripts.]

[Letter from John O'Donovan (8 Newcomen Place, North Strand, Dublin) to William Reeves, discussing building projects of the Gaelic aristocracy in Ulster.]

[Letter from John O'Donovan (36 Buckingham Street, Dublin) to William Reeves, discussing the meaning of the Irish word buidechuir.]

[Letter from John O'Donovan (36 Buckingham Street, Dublin) to William Reeves, concerning the Life of Patrick.]

[Letter from John O'Donovan (8 Newcomen Place, North Strand, Dublin) to William Reeves, requesting a third opinion on deciphering MacDonnell's deed, and discussing the current census and the state of the Irish language.]

[Letter from John O'Donovan (47 Essex Street, Dublin) to George Petrie (21 Great Charles Street, Dublin), discussing the meaning of some Irish words, as well as Cormac Mac Cullenan's will.]

[Letter from John O'Donovan (36 Buckingham Street, Dublin) to William Reeves, asking for financial advice.]

[Letter from John O'Donovan (36 Buckingham Street, Dublin) to William Reeves, discussing translation work of Irish manuscripts.]

[Letter from Joannen Donovaniden [John O'Donovan] (Ulster Railway Hotel, Belfast, Co. Antrim), to William Reeves (The Vicarage, Lusk, Co. Dublin), discussing the Dinnsenchus of Armagh.]

[Letter from Sean O'Dondubhain [John O'Donovan] to an unidentified recipient, discussing a passage in the Annals of the Four Masters and various translations of it.]

[Two letters and two notes from John O'Donovan (36 Buckingham Street, Dublin) to William Reeves, discussing the identity of Berichter according to the Irish annals, and generally highlighting the importance of antiquarian studies.]

[Letter from William Reeves (London) to John O'Donovan; includes O'Donovan's response, discussing an old manuscript of Adamnan.]

[Letter from William Reeves (The Vicarage, Lusk, Co. Dublin) to John O'Donovan, asking for English translation of an Irish passage quoted in a work by Zeuss; includes O'Donovan's response.]