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PIARC (World Road Association), founded in 1909 and comprising 125 member governments from all over the world, is the global forum for exchange of knowledge and experience on roads, road transport policies and practices. With consultative status to the Economic and Social Council of the United Nations, the Association is contributing to a stable and sustainable global development of the road and transport sector.

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XIVth World Road Congress - Prague 1971 - Reports by Technical Committees

Committee on road tunnels. Documentation and studies

pp 0-227

pp 229-420

pp 421-590