Deeds and documents 1404-1979, relating to the Penllergaer estate in Breconshire and Glamorgan, including deeds and papers relating to coal mining in Glamorgan and Carmarthenshire, mainly nineteenth century; and letters and papers of the following: John Llewelyn of Penllergaer, 1790-1816, John Dillwyn Llewelyn, 1824-1840, William Dillwyn and Lewis Weston Dillwyn.