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1LlyfrCyhoeddwyd 1991“...United States. Congress. Office of Technology Assessment...”
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2LlyfrCyhoeddwyd 1988“...United States. Congress. Office of Technology Assessment...”
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3Dogfen y Llywodraeth LlyfrCyhoeddwyd 1994“...United States. Congress. Office of Technology Assessment...”
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4Dogfen y Llywodraeth LlyfrCyhoeddwyd 1989“...United States. Congress. Office of Technology Assessment...”
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5LlyfrCyhoeddwyd 1978“...United States. Congress. Office of Technology Assessment...”
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6Dogfen y Llywodraeth LlyfrCyhoeddwyd 1993“...United States. Congress. Office of Technology Assessment...”
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7Dogfen y Llywodraeth LlyfrCyhoeddwyd 1983“...United States. Congress. Office of Technology Assessment...”
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8Dogfen y Llywodraeth LlyfrCyhoeddwyd 1992“...United States. Congress. Office of Technology Assessment...”
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9Dogfen y Llywodraeth Llyfrgan Nair, Indira“...United States. Congress. Office of Technology Assessment...”
Cyhoeddwyd 1989
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10Llyfrgan Chubin, Daryl E.“...United States. Congress. Office of Technology Assessment...”
Cyhoeddwyd 1990
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11LlyfrCyhoeddwyd 1985“...United States. Congress. Office of Technology Assessment...”
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12LlyfrCyhoeddwyd 1981“...United States. Congress. Office of Technology Assessment...”
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13LlyfrCyhoeddwyd 1985“...United States. Congress. Office of Technology Assessment...”
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14LlyfrCyhoeddwyd 1979“...United States. Congress. Office of Technology Assessment...”
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15Dogfen y Llywodraeth Cylchgrawn
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16Dogfen y Llywodraeth LlyfrCyhoeddwyd 1981“...United States. Congress. Office of Technology Assessment...”
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17Llyfrgan Roberts, David J.“...United States. Congress. Office of Technology Assessment...”
Cyhoeddwyd 1981
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18LlyfrCyhoeddwyd 1975“...United States. Congress. Office of Technology Assessment...”