Publications (2)
- Richards, Alun John (1991); Gazeteer of the Welsh Slate Industry, A; Gwasg Carreg Gwalch 978-0863811968
- Richards, Alun John, (1999); The Slate Regions of North and Mid Wales and their Railways; Gwasg Carreg Gwalch; 0863816057
Llyn Gamallt - 189m
Cwm Teigl - 633m
Gamallt - 1,024m
Clogwyn Garw - 1,078m
Chwarel Llew Twrog - 1,211m
Sarn Helen - 1,325m
Nantpistyll Gwyn - 1,412m
Chwarel Llew Twrog - 1,435m
Level - 1,457m
Manod - 1,465m
Ffridd - 1,608m
Frudd - 1,641m
Foel-Gron - 1,655m
Drum - 1,664m
Foel Rudd - 1,695m
Carters - 1,747m
South Pole - 1,751m
Trial level - 1,799m
Blaen y Cwm - 1,823m
Rhiwbach - 1,898m
Nelw Williams Quarry - 1,997m