Information about the extent of the estate can be found at DD/BROD/1/1-8, DD/BROD/2/1-25, DD/BROD/7/1-16, DD/BROD/17/36 and DD/BROD/20/1-19. The family also enjoyed income from property in London, acquired as a consequence of the marriage of CSA Thellusson to Georgiana Theobald. Records relating to their post nuptial settlement are to be found at DD/BROD/3/1-28 and DD/BROD/9/83-155. At various times, the estate included property in Hertfordshire, Amotherby in the North Riding of Yorkshire, Northamptonshire, Warwickshire and Quinnish in Argyllshire. Records relating to these properties can be found at DD/BROD/10/1-4, DD/BROD/17/29, DD/BROD/18/8, DD/BROD/21/1-10, DD/BROD/22/1-6 and DD/BROD/23/1.
The mining of coal on the estate, following the sinking of Brodsworth colliery from 1905, led to the creation of Woodlands, a model colliery village at Adwick le Street and the growth of Adwick le Street itself. Records relating specifically to these developments can be found at DD/BROD/4/13-18 and DD/BROD/21-44, DD/BROD/9/156-173, DD/BROD/11/12, DD/BROD/17/1-6 and DD/BROD/17/31-35, DD/BROD/18/1, DD/BROD/20/34-53, DD/BROD/20/58-151, DD/BROD/20/153-157 and DD/BROD/23/9. Additionally, information on this, as on other aspects of the management of the estate, is to be found in the correspondence of the agent for the estate in DD/BROD/15 and DD/BROD/16.
The few personal papers of the family are catalogued at DD/BROD/14/1-43 and are largely concerned with its interest in yachting. Records relating to the fabric of the Hall are to be found at DD/BROD/12/1-14, DD/BROD/13/1-25 and DD/BROD/17/39.
From 1891, there is a relatively substantial quantity of records relating to the activities of successive agents to the estate, particularly annual and other accounts (see DD/BROD/9/1-15, DD/BROD/10/1-4 and DD/BROD/11/1-25), correspondence (DD/BROD/15 AND DD/BROD/16) and subject files and other records (DD/BROD/17 and DD/BROD/18).