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1Argitaratua 1994Gaiak “...Underwater tunnels English Channel History....”
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2nork Wilson, Keith M.Gaiak “...Railroad tunnels English Channel History....”
Argitaratua 1994
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4nork Corliss, Paul, 1953-Gaiak “...Tunneling New Zealand Christchurch....”
Argitaratua 2014
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8nork Barrie, Alexander, 1923-Gaiak “...World War, 1914-1918 Tunnel warfare....”
Argitaratua 1988
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