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1Cyhoeddwyd 1825
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4Cyhoeddwyd 1756
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6Cyhoeddwyd 1903
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8gan McCulloh, R. S (Richard Sears), 1818-1894
Cyhoeddwyd 1852
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11gan Cutbush, James, 1788-1823
Cyhoeddwyd 1814
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12Cyhoeddwyd 1767
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13gan Ure, Andrew, 1778-1857
Cyhoeddwyd 1842
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14gan Ure, Andrew, 1778-1857
Cyhoeddwyd 1878
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15gan Ure, Andrew, 1778-1857
Cyhoeddwyd 1844
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16gan Tolhausen, Alexandre
Cyhoeddwyd 1870
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17gan Tolhausen, Alexandre
Cyhoeddwyd 1870
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18gan Le Chatelier, Henri, 1850-1936
Cyhoeddwyd 1925
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20
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