Two authoritative catalogues of Welsh Medals in the collection of Mr R.D. Roberts of Bethesda, probably the greatest Welsh authority on the subject

Nothing could excel the care, exactness, and real scholarship shown by Mr Roberts in these compilations; very fortunately, Mr Roberts is also an expert in heraldry and genealogy, both of which are essential to the right placing and understanding of the various types of medals. An exhaustive index has been supplied to both volumes