Casgliadau Arlein
Amgueddfa Cymru
Chwilio Uwch
The Powell Duffryn Steam Coal Company Limited (booklet)
''Penallta' Washed Mixture Its Production Its Preparation Its Performance''. 13 pages in blue covers, stapled. Undated.
Pwnc
Diwydiant
Rhif yr Eitem
2018.51/90
Mesuriadau
Meithder
(mm): 242
Lled
(mm): 186
Nid yw sylwadau ar gael ar hyn o bryd. Ymddiheuriadau am yr anghyfleustra.