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1LlyfrCyhoeddwyd 1980“...American Society of Civil Engineers. Technical Council on Lifeline Earthquake Engineering...”
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2Trafodyn Cynhadledd LlyfrCyhoeddwyd 1988“...American Society of Civil Engineers. Technical Council on Lifeline Earthquake Engineering...”
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3LlyfrCyhoeddwyd 1977“...American Society of Civil Engineers. Technical Council on Lifeline Earthquake Engineering...”
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4Trafodyn Cynhadledd LlyfrCyhoeddwyd 1995“...American Society of Civil Engineers. Technical Council on Lifeline Earthquake Engineering...”
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5Cylchgrawn“...American Society of Civil Engineers. Technical Council on Lifeline Earthquake Engineering...”