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Archival description- 5.
- File
- October 1945.
Chart compiled by T.W. Harcourt Roberts, illustrating the coal seams of the Gwendraeth Valley of East Carmarthenshire and the Hook coalfield, Pembrokeshire.
- 2.
- File
- October 1948.
Folder of material compiled by T. W Harcourt Roberts, entitled 'Nolton-Newgale Coalfield, St. Brides Bay, Pembrokeshire: its history, structure and economic possibilities'. The folder is accompanied by a list of its contents.