[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, discussing the forthcoming elections in Trinity College, Dublin.]

[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 Count Charles MacDonnell's letter.]

[Letter from John O'Donovan (36 Buckingham Street, Dublin) to William Reeves, concerning a request from Robert MacAdam, and discussing Reeves's work on Life of Patrick.]

[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 John O'Donovan (8 Newcomen Place, North Strand, Dublin) to William Reeves, discussing the provenance of the Belfast bell, and referring to an internal dispute in the Royal Irish Academy.]

[Letter from John O'Donovan (Trinity College, Dublin) to William Reeves (Lusk, Co. Dublin), discussing the Irish names for the names of the week.]

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

[Letter from John O'Donovan (36 Buckingham Street, Dublin) to William Reeves, discussing some copy-editing matters, and pointing out the forgeries of Shane O'Dugan's time.]

[Letter from J. Donnavanides [John O'Donovan] (36 Buckingham Street, Dublin) to William Reeves, concerning the young linguist Whitley Stokes.]

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

[Letter from John O'Donovan (36 Buckingham Street, Dublin) to William Reeves, discussing Scottish place names and women's names.]

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

[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 John O'Donovan (8 Newcomen Place, North Strand, Dublin) to William Reeves (Parsonage House, Ballymena, Co. Antrim), discussing the meaning of some Irish words, particularly from the Belfast bell inscription.]

[Letter from John O'Donovan (8 Newcomen Place, North Strand, Dublin) to William Reeves, discussing in particular the inscription of a bell in Belfast.]

[Letter from John O'Donovan (8 Newcomen Place, North Strand, Dublin) to William Reeves, returning answers to some queries and discussing work on the Annals.]

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

[Letter and note from John O'Donovan (8 Newcomen Place, North Strand, Dublin) to William Reeves (Ballymena, Co. Antrim), discussing the O'Neill and O'Donnell genealogies.]

[Letter from John O'Donovan (8 Newcomen Place, North Strand, Dublin) to William Reeves, seeking advice on producing a subject index for his book.]

[Letter from John O'Donovan (8 Newcomen Place, North Strand, Dublin) to William Reeves (Parsonage House, Ballymena, Co. Antrim), concerning his work, health and his desire to emigrate to America.]

[Letter from John O'Donovan (8 Newcomen Place, North Strand, Dublin) to William Reeves (Ballymena, Co. Antrim), discussing difficulties of his work.]