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1Trafodyn Cynhadledd LlyfrCyhoeddwyd 1973“...Specialty Conference on Cold-Formed Steel Structures St. Louis, Mo....”
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2Trafodyn Cynhadledd LlyfrCyhoeddwyd 1978“...International Specialty Conference on Cold-Formed Steel Structures St. Louis, Mo....”
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3Trafodyn Cynhadledd LlyfrCyhoeddwyd 1981“...International Specialty Conference on Cold-Formed Steel Structures St. Louis, Mo....”