Publications (3)
- (1991); CATMHS - Newsletter 029-April; 27 pages
- Lewis, M.J.T, (2003). Blaen y Cwm and Cwt y Bugail Slate Quarries. Adit Publications. ISBN: 0952297930
- Richards, Alun John (1991); Gazeteer of the Welsh Slate Industry, A; Gwasg Carreg Gwalch 978-0863811968
Frudd - 190m
Ffridd - 235m
Nelw Williams Quarry - 285m
Offeren - 591m
Bwlch y Slaters - 639m
Rhiwbach - 682m
Cwt y Bugail - 706m
South Pole - 1,216m
Graig Ddu - 1,244m
Clogwyn Garw - 1,315m
Cwm Teigl - 1,525m
Chwarel Llew Twrog - 1,630m
Rhiwbach Drainage Adit - 1,697m
Y Garnedd - 1,823m
Chwarel Llew Twrog - 1,905m
Penmachno - 1,966m
Llyn Gamallt - 1,973m