Casgliadau Arlein
Amgueddfa Cymru
Chwilio Uwch
East Moors Works Agglomeration Plant, notes
Title: "Sieve Analysis (B.S. Sieve). Wet Sieving". Two pages, typed in black ink on cream paper.
Nid yw sylwadau ar gael ar hyn o bryd. Ymddiheuriadau am yr anghyfleustra.