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21Proceedings 1987 Rapid Excavation and Tunneling Conference, New Orleans, Louisiana, June 14-18, 1987Baskı/Yayın Bilgisi 1987Kitap
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22
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27Proceedings 1981 Rapid Excavation and Tunneling Conference, San Francisco, California, May 3-7, 1981Baskı/Yayın Bilgisi 1981Kitap
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