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1LlyfrCyhoeddwyd 1962“...American Society for Testing and Materials...”
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2Cyfresol
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3Cyfresol
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4LlyfrCyhoeddwyd 1972“...American Society for Testing and Materials...”
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5LlyfrCyhoeddwyd 1969“...American Society for Testing and Materials...”
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6LlyfrCyhoeddwyd 1993“...American Society for Testing and Materials...”
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7LlyfrCyhoeddwyd 1990“...American Society for Testing and Materials...”
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8LlyfrCyhoeddwyd 1992“...American Society for Testing and Materials...”
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9
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10LlyfrCyhoeddwyd 1983“...American Society for Testing and Materials...”
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11LlyfrCyhoeddwyd 1993“...American Society for Testing and Materials...”
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12LlyfrCyhoeddwyd 1976“...American Society for Testing and Materials...”
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13
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14LlyfrCyhoeddwyd 1994“...American Society for Testing and Materials...”
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15LlyfrCyhoeddwyd 1993“...American Society for Testing and Materials...”
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16Llyfrgan Foster, John Farley, 1910-“...American Society for Testing and Materials...”
Cyhoeddwyd 1974
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17LlyfrCyhoeddwyd 1959“...American Society for Testing and Materials...”
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18LlyfrCyhoeddwyd 1947“...American Society for Testing and Materials...”
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19LlyfrCyhoeddwyd 1972“...American Society for Testing and Materials...”
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20CyfresolCyhoeddwyd 1970“...American Society for Testing and Materials...”