Dangos 2 canlyniad

Manuscript report by William Galloway on the Corwg Merthyr colliery, Glamorgan, including a brief history of the Corwg Merthyr Coal Company, with statistics, two plans, cross sections of seams and three cross sections of geological strata.

Typescript report on the Glyncymmer, Treshenkin and Glenavon collieries, Glamorgan, by William Galloway, with financial information, statistics, notes, a map and a plan.