Darlithoedd a nodiadau ar enwau priod ac enwau lleoedd yng Nghymru yn bennaf. Mae'r ffeil hefyd yn cynnwys proflenni'r gyfrol Rhestr o enwau lleoedd (Caerdydd, 1958). Roedd G. J. Williams yn un o'r rhai a fu'n cynghori Elwyn Davies, golygydd y gyfrol, ynglŷn â'r gwaith.

'Crynolion Hanesyddol Dyfed, Geirdarddiaeth', being miscellaneous notes by David Owen Thomas on the etymology of Welsh words and on place names and personal names, together with extracts from Irish literature, with translations, and from miscellaneous sources.

A mutilated index (place and personal names) to a manuscript of Welsh pedigrees, together with an incomplete index of Cheshire names.

Fifty-three files of unbound material accumulated by Bradney during the preparation of A History of Monmouthshire and containing press and proof copies, transcripts and abstracts of, and extracts from, manuscripts, deeds and documents, holograph and autograph letters, pedigrees and genealogical notes, press cuttings, etc., generally arranged under parishes. Much of the material is in the autographs of friends and official copyists. This volume contains letters, 1907; and copies of addresses by Bradney on the history of Abergavenny, Chepstow, Gwent, Grosmont, Llanthony, Llantilio Crossenny, Mathern, Monmouth Castle, Pencoed, Raglan, Raglan Castle, St Pierre, Tintern, Tretower and Trostrey, and on Welsh surnames, etc.