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Amgueddfa Cymru – Museum Wales
Pair of maps in case with inscription 'South Wales Coal Basin' on front. Each map is labelled on covers W and E respectively in pencil. Both made up of Geological Survey one-inch Old Series sheets, 1870s editions. W sheet contains 37 (west part), 38, 40 (south part), 41 (SW part). E sheet contains 36, 37 (east part), 41 (SE part), 42SW, 42SE.
