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1Cyhoeddwyd 1967“...Institution of Mechanical Engineers. Proceedings, 1966-67, v. 181, pt. 3M...”
Trafodyn Cynhadledd Llyfr -
2Cyhoeddwyd 1969“...Institution of Mechanical Engineers. Proceedings, 1968-69, v. 183, pt. 3M...”
Trafodyn Cynhadledd Llyfr -
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