Pembrokeshire Slate Industry: Colour slides showing views of Upper and Lower Tyrch Slate Quarries. Includes copies of pages from Tyrch 'Order Book'. Collected or produced by former Royal Commissioner D.G.Tucker and his wife, Mary. Some of the material appears in an illustrated contribution 'The Slate Industry of Pembrokeshire and its Borders' published in the 'Industrial Archaeology Review', Vol. III, Number 3, Summer 1979.
