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2. 2) H. STRAUB : A History of Civil Engineering, translated from the German "Die Geschichte der Bauingenieurkunst" (1949), English translation by E. ROCKWELL (1960) [Leonard Hill Limited]
3. 5) G. ROISECCO : L'Architettura Del Ferro, Bulzoni Editore (1972)
4. 8) R. HAMMOND : Engineering Structural Failures (1956) [Odhams Press Limited]