The collection consists predominantly of estate papers, although some personal/family papers and genealogical records are also included.
Accounting records for the estates include ledgers, cashbooks and two registers of mortgages, as well as a series of annual accounts in 34 leather bound volumes entitled 'Amalgamated Income Account and Auditor's Report on the Accounts' (1889-1925). There are volumes of general estate papers such as labour accounts, lists of tenants and copyholders, and 'cultivation books' providing details of tenants, their land holdings and the type of cultivation practised on them. A series of inventories gives details of plate belonging to the Dukes of Newcastle, of beer and ale consumed and of pictures and paintings. There is also a series of yearly rentals for the Nottingham county estates, the Newark estate, the Clumber estate and for other 'large holdings'.
Of particular interest is the series of surveys relating to the Nottinghamshire estates. These include surveys of Newark dated 1762 and 1790 and a report and survey of the churches on the Nottinghamshire estates carried out by George Gilbert Scott, architect, in 1853. In addition, there is a significant number of maps included in the collection. These date between 1689 and 1931, with the main concentration being nineteenth century. They relate to individual Nottinghamshire estates and whilst some are annotated Ordnance Survey maps, many are original works by local surveyors.
The personal/family papers consist of a number of appointments to offices and grants of honours, such as letters patent for the appointment as Lord Lieutenant of Nottinghamshire or as Keeper of the Rolls for Nottinghamshire. An important series of genealogical and historical papers relate mainly to the Clinton family and the Earls of Lincoln, including letters and notes concerning the research undertaken on their behalf by T.D. Fosbroke. A miscellaneous section of papers includes items such as illuminated addresses to various Dukes of Newcastle.