1000 resultados para Bradley, Everett (1897-1969) -- Portraits
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Donateur : Bonaparte, Roland (1858-1924)
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Donateur : Bonaparte, Roland (1858-1924)
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The Iowa State Highway Commission has adopted a number of rigid safety requirements that the Bureau of Public Roads has set forth as standards for road construction. One of these safety requirements is the elimination of two piers on Interstate grade separations, thus leaving two long spans. These longer spans lower the ability of prestressed concrete beams to compete economically with steel beams. In an effort to be more competitive, the prestressing companies have been studying the use of lightweight aggregate in structural concrete.
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[Vente. Art. 1857-11-09. Paris]
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[Vente. Estampes. 1858-11-18. Paris]
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[Vente. Estampes. 1859-12-12 - 1859-12-15. Paris]
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[Vente. Estampes. 1860-12-17 - 1860-12-18. Paris]