File includes manuscript notes on index cards by Etienne Rynne with detail on the Gundestrup Cauldron. Further notes and copy published material explores this topic in relation to the Táin and the archaeology of the Celtic hero.

File includes research notes and articles by Etienne Rynne relating to finds of bog-butter in locations in co. Galway, such as Ballygar, 1983; Lattoon Bog, Ahascragh, Co. Galway, 1997. Correspondence between Rynne and Mary Cahill, Irish Antiquities Division, National Museum of Ireland (1985); Michael Ryan, Keeper of Irish Antiquities, National Museum of Ireland; and Aine O'Neill, Irish folklife division, National Museum of Ireland. 1991; Andy Halpin, Irish Antiquities Division, 1997; and other related letters. The correspondence discusses the various finds of bog-butter, transfer to the National Museum and related matters. Includes copy of MS report by Etienne Rynne entitled "Bog Butter from Pollacapple, Co. Galway."

File includes manuscript drawings and maps on grid paper, with MS notes and writings for souterrain in Co. Galway, by Etienne Rynne; correspondence between Rynne and Brian Duffy, Senior Archaeologist, Archaeological Survey, Co. Westmeath (1983) re. souterrain at Ballymote; letters between Rynne and Paul Gosling re. souterrain near Kilmaine, Co. Mayo, and file report with descriptions, black and white photographs with OS map extract for souterrain at Ballynacarragh.
File Two includes published research material, articles, book extracts etc. re. souterrains.

File includes research material, notes and correspondence relating to dug-out canoes. Includes letters between Etienne Rynne and Niall Gregory; Una Mac Dowell; Joseph Raftery (Keeper of Irish Antiquities, National Museum of Ireland - 1971 - 1975) and others. Includes reports and written articles by Etienne Rynne on "Investigation of Two Dug-Out Canoes at Eskerstephens, Co. Galway"; "Inspection of a Dug-Out Canoe an Lough Dargan, Co. Sligo." and other notes of canoes found in Ireland.
File Two includes assorted press cuttings of news on dug-out canoes and printed and published works studied by Rynne.
File also includes a batch of black and white photographic prints of a dug-out canoe being excavated at an unnamed location.

File includes research manuscript notes on the topic of ringforts by Etienne Rynne. Includes index cards and other assorted manuscript research notes by Rynne; short TS report by Rynne entitled "Ringforts and Their Problems"; Correspondence between Rynne and Robin Glasscock, Department of Geography, Queen's University Belfast, discussing research interests and projects relating to the Group for the Study of Irish Historic Settlement. (1970) Minutes of meetings, agenda and related documents relating to meetings and actions of the group also present. Also assorted copies and offprints of research articles on ringforts and also press cuttings of Irish news coverage of same.

File of manuscript research notes regarding Irish and also Welsh promontory forts. includes reference to work by Marcus Casey on Irish promontory forts.

File includes research material on Dun Aengus fort, located on Inis Mór, (Aran Islands) and other forts on the islands by Etienne rynne. includes manuscript and TS draft article by Rynne, "Dún Aengus - A Place of Mystery". File also includes research notes and field drawings of objects, carvings, crosses and other items from Inis Mór; Also TS article by Rynne, Dún Aengus - Fortress or Temple?" file also includes letters between Rynne and cartographer Tim Robinson, discussing excerpts from "Stones of Aran" by Tim Robinson and sent to Rynne, also discuss matters relating to Dun Aengus and forts on the Aran Islands. (1984). Black and white photographic prints with aerial images from Cambridge University Collection of Dún Aengus, sent to Rynne in 1981; Also black and white photographic prints of Dún Chonchuír, Inishmaan, Aran Islands.
File 2 includes copies of published articles used in research by Rynne.

File includes research material and notes written by Etienne Rynne "The Bell of St. Patrick" and "St. Patrick's Possessions". Also includes black and white photographs of the bell and the bell shrine of St. Patrick, from the National Museum of Ireland.

Includes index cards with manuscript notes on topics such as holy wells, inauguration rites and ceremonies, Giraldus Cambrensis, cursing stones, bleeding cattle, and the swastika symbol. Othr manuscript notes by Rynne address a series of similar topics. Includes notes made at a Thomas Davis lecture, 9 Jan 1972 by [ ] Byrne, on topic of "Kings and Commons in Celtic Ireland".

File of detailed research notes by Etienne Rynne on topics such as pagan and Celtic mythology. Includes a text of a published book review by Rynne of "Celtic Mythology" by Proinsias MacCana, Hamlyn Publishing Group, 1970. Also a black and white photograph of an unnamed stone carving of a figure with its arms crossed in front.