The rent ledgers devote a single page or a single opening to each tenant, giving name, a description of the holding concerned together with its location, the rents due and paid, and after 1846, sometimes a reference to the appropriate page of the rental survey. In the earlier volumes, rents may be further broken down, distinguishing rent proper from land and property tax, and adding to or deducting from the rent due as property is added to or deducted from the holding. -- At any one time, a group of rental ledgers were in use, with new groups of books started in 1787, 1806, 1818, 1846, 1856, 1885-87, 1900-1904, and 1912-1914. The earliest groups of Monmouthshire estate rent ledgers, formerly MSS 365-384 (1779-1847), are briefly listed in the Preliminary Schedule of the Tredegar Park Muniments, pp. 3640-3711. From 1846, the books within each concurrent group are distinguished by letters of the alphabet: 1846, A-E; 1856, A-G (two G's); 1885-87, A-H; 1900-1904, A-D, E (two), J (two), K, T; and 1912-1914, A-B, D, F, J, Z. A few books get out of synch with the rest of the group, for example, the contents of successive volumes D are dated 1846-1856, 1856-1877, 1878-1896, 1897-1911, 1913-1927. The letter by which each volume is identified on its spine is given in the list below. -- Within each ledger, properties within a single parish tend to be listed together, although properties within a single parish may be split between several of the concurrent volumes. The majority of entries have a back reference to the 'Old Ledger' folio number, and a forward reference to the 'New Ledger'. Generally a property will descend from, for example, one ledger 'A' to the next ledger 'A'; this is especially true between 1846 and 1900, but before and after that period a ledger may have entries forwarded from several previous volumes, and may contribute entries to several successor volumes. However, many properties have a direct descent, as for example, Penyrheol Farm in the parish of Rumney, which descends through each ledger 'A' in turn from 1846 (AMA 10/23, fo. 35, with a back reference to 'OL, fo. 112', viz., AMA 10/20), to 1956, when the freehold was sold (AMA 10/67, fo. 84). -- The arrears accounts for 1898-1903 (AMA 10/45) and 1913-1932 (AMA 10/58) and a number of ledgers of weekly and monthly rents (AMA 10/56-57, 10/59) have been included in this series for convenience.