Correspondence, 1907-1908, mainly relating to the publication of Sixteen Welsh Melodies, [?1909], mainly between J. Lloyd Williams, Arthur Somervell and A. P. Graves as co-authors. Letters from Lucy Broadwood and Mary Davies are also included.
Diaries, journals and log books, 1871-1920, containing entries reflecting J. Lloyd Williams's interest, research and vocation in the field of botany, spanning his entire career.
Notes and correspondence relating to a survey on land reclamation in North Wales, [1913x1916], to which J. Lloyd Williams contributed. Notes specifically relating to Caernarfonshire and Anglesey and North Wales grasses are also included.
Letters, 1900-1945, from J. Lloyd Williams's sister, Elizabeth (Lizzie), to her brother. Many of the later letters relate to his memoirs. Copies of letters (5), 1938-1945, from J. Lloyd Williams to his sister are also included.
The file comprises copy letters, October 1883 to December 1884, from J. Lloyd Williams, to various individuals, institutions, &c. A number of letters to family members are also included.
Letters, 1945-1946, from the Librarian, the National Library of Wales, to Dr Idwal Lloyd Williams, relating to the depositing of his father's papers and manuscripts at the Library.