Casgliadau Arlein
Amgueddfa Cymru
Chwilio Uwch
Electrical Engineering (periodical)
Blue print on white paper cover. Electrical Engineering, No. 184. (Vol VI., No. 27), July 7, 1910. Advertisements at front and reverse.
Nid yw sylwadau ar gael ar hyn o bryd. Ymddiheuriadau am yr anghyfleustra.