List of N.C.B Sources of Washed Anthracite Duff. 1 Cynheidre Washed Duff, 2 Abernant Washed Duff, 3 Onllwyn Washed Duff, 4 GCG Washed Duff, 5 Coedbach Washed Duff, 6 Banwen Washed Duff, 7 Wernos Washed Duff, 8 Aberpergwm Washed Duff, 9 Carway Washed Duff (1640/76/SW) 1976

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