Rail and road tunnels at Velsen. Similar description indexed in Engineering Index 1957 p 1181 from Eng News-Rec Mar 2 1957, under Tunnel Construction.
Railway tunnel under Netherlands North Sea Canal
Ry Gaz
Railway Gazette ; 108 , n 2
1958
Aufsatz (Zeitschrift)
Englisch
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Tunnels at Velsen, Netherlands, under Amsterdam-North Sea navigation canal
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