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1Proceedings 1987 Rapid Excavation and Tunneling Conference, New Orleans, Louisiana, June 14-18, 1987Foilsithe / Cruthaithe 1987LEABHAR
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2Proceedings 1981 Rapid Excavation and Tunneling Conference, San Francisco, California, May 3-7, 1981Foilsithe / Cruthaithe 1981LEABHAR