Presentation titled 'Atgofion William John...
Vol.1 of a manuscript of the history of Penrhyn...
Vol.2 of a manuscript of the history of Penrhyn...
Vol.1 (transcription) of a manuscript of the...
Vol.2 (transcription) of a manuscript of the...
Index pages of a manuscript of the history of...
Penrhyn Quarry, 1913
Penrhyn slate quarries, near Bangor