A POPULAR ILLUSTRATED WEEKLY OF THE WORLD'S PROGRESS The central span Is 182 feet long and towers 800 feet above the torrent below., scientific american, -1909-08-14, False work for the great masonry viaduct between Wiesen and Filisur, Switzerland


A POPULAR ILLUSTRATED WEEKLY OF THE WORLD'S PROGRESS The central span Is 182 feet long and towers 800 feet above the torrent below., scientific american, -1909-08-14, False work for the great masonry viaduct between Wiesen and Filisur, Switzerland


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