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#265 Tunnelling Innovation: Inventing the Bentonite Shield
Sixty years ago a civil engineer called John Bartlett of Mott, Hay & Anderson had a revolutionary idea. He noticed that bentonite clay could be
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#99 Urbanisation: Infrastructure for Growing Cities
Today the world holds 33 megacities, cities that are home to over 10 million people. As these sprawling urban centres become more crowded than ever before