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1LlyfrCyhoeddwyd 1957“...United States. Office of Ordnance Research...”
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2LlyfrCyhoeddwyd 1957“...United States. Office of Ordnance Research...”
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3Trafodyn Cynhadledd LlyfrCyhoeddwyd 1959“...United States. Office of Ordnance Research...”
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4Trafodyn Cynhadledd“...United States. Office of Ordnance Research...”