Only 10 minute books survive as records of Edenderry Union covering the years 1879-1919, with many large gaps. There are no extant workhouse registers, registers of deaths, workhouse ledgers, outdoor relief registers, or registers of accounts.

A further known minute book from 1895, which was rescued from the workhouse following its demolition in 1976 and is now in private hands, has been transcribed by Dr Ciaran Reilly in an article ‘The minute book of Edenderry Poor Law Union, 1895’ in Offaly Heritage, Vol. 7 (Tullamore, 2013)

The minutes contain the proceedings of the meetings of the boards of guardians and contain reports from the clerk of the union, the master of the workhouse, the sanitary officers and others.

Collection of books, press cuttings, photographs, and memorabilia related to the Leinster Regiment at Birr Barracks, collected by Henry G. Farmer (1882-1965), son of Sergeant Henry G. Farmer, quarter-master, Leinster Regiment, Birr Barracks.

Volume of drawings and specifications of pattern articles to be adapted in War Department works and buildings. Issued to Birr Barracks.

Collection of photographs relating to Birr Barracks and the Leinster Regiment, many of which are reproductions of original photographs by William Lawrence and others. Contains an original group portrait King's County Rifles, Birr (1872), and several images of the Barrack Square. Also contains the only known image of the interior of the barracks, 'The Coffee Bar, Leinster Depot.'

Photograph album created by Lt. Col. M. O'Carroll Fitz-Simon, M.C. , who began his military career in Prince of Wales' Leinster Regiment, which was headquartered at Birr. The photographs document a peace-keeping mission the Leinsters undertook in Silesia (now part of Poland) from their departure at Dover on 31 May 1921, through Germany and to their destination of Oppeln (Opole in Poland today). Following the disbandment of the regiment in June 1922, Fitz-Simon joined the King's Own Regiment, Lancaster and the remaining photographs in the album depict scenes from missions in India and Burma. There is also a small number of photographs of people and houses in the Birr area including Whigsborough House, and the burnt out remains of Birr Barracks (following its destruction in the Civil War in July 1922).

Timber account ledger kept by Captain A. Wolsesly Cox, listing oak trees at Clara House. Information given on location (around the house, 'Deer Park; and 'by the lake'), height, girth, and cubic feet in tree. 1 January - 8 November 1872.