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11
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12
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13nork American Society of Civil Engineers
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14Argitaratua 1990Liburua
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15Proceedings 1987 Rapid Excavation and Tunneling Conference, New Orleans, Louisiana, June 14-18, 1987Argitaratua 1987Liburua
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16Proceedings 1981 Rapid Excavation and Tunneling Conference, San Francisco, California, May 3-7, 1981Argitaratua 1981Liburua
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17
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18
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20