The author's own copy of A catalogue of the manuscripts relating to Wales in the British Museum, No. IV, with notes, corrections and additions in his hand.
Also, inserted into the leaves of the catalogue are letters addressed to Edward Owen, a sheaf of rough notes and jottings on various historical and antiquarian subjects and newspaper cuttings. Amongst the correspondents are J. Glyn Davies, Sir E. Vincent Evans and Lord Howard de Walden.