The letters, 1900-1925, concern books, publishing, printing and librarianship matters. Many of the letters relate to the publication of J. H. Davies's Bibliography of Welsh Ballads. Some concern the affairs of the Welsh Bibliographical Society or the Carmarthen Antiquarian Society, and some derive from D. Rhys Phillips's work as Welsh Librarian at Swansea.

The letters, 1904-1924, concern Francis Green's antiquarian researches and publications. Many concern the Historical Society of West Wales of which Francis Green was secretary. The file also contains a stray letter, July 1911, from Walter Spurrell to Francis Green.

Most of the letters, 1897-1917, relate to the author's academic and antiquarian researches into Pembrokeshire history. Many are enquiries to be answered by J. H. Davies. There are also occasional references to local affairs and family matters.