Casgliadau Arlein
Amgueddfa Cymru
Chwilio Uwch
Sections of Strata (ledger)
Circa 300 page ledger filled-in by hand with detailed sinking records for various collieries. Undated, but circa 1910.
Nid yw sylwadau ar gael ar hyn o bryd. Ymddiheuriadau am yr anghyfleustra.