Casgliadau Arlein
Amgueddfa Cymru
Chwilio Uwch
A modern Surveying Instrument for Secondary Surveys (booklet)
Information Bulletin No. MP(50)12. '50/32' handwritten beneath bulletin number. 5 pages.
Nid yw sylwadau ar gael ar hyn o bryd. Ymddiheuriadau am yr anghyfleustra.