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3. H. Straub: A History of Civil Engineering – An Outline from Ancient to Modern Times (MIT Press, Cambridge 1964)
4. R. Reese, W.A. Kawahara: Handbook of Structural Testing (Society of Experimental Mechanics, Bethel 1993)
5. H. Erwin: OSHA 1910 General Industry Standards Made Easy, 2nd edn. (Erwin Training Institute, Edmonton 1989)