An indexed armorial compiled by Thomas, containing the arms, coloured by hand in many instances, of a number of North Wales families and a few from the Border counties and South Wales, together with a few bookplates.

A copy of the second edition of Edward Parry, Royal Visits and Progresses to Wales ... (London, 1851), to the margins of which have been added over eight hundred coats of arms, coloured by hand, of persons and families mentioned in the text. There is also a manuscript index to the coats of arms.