Valtschiel Bridge
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Billington, David P. (1990): Robert Maillart and the Art of Reinforced Concrete. The MIT Press, Cambridge (USA), pp. 35-39.
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Billington, David P. (1979): Robert Maillart's Bridges. The Art of Engineering. Princeton University Press, Princeton (USA), pp. 146.
https://doi.org/10.1515/9780691216072