Mechanization for road and bridge construction a review of the interaction between design and specification and the use and development of mechanized methods : proceedings of a symposium by the Institution of Civil Engineers and the Institution of Highway Engineers held on 17 February, 1972 in London / [editor, Kirstine S.L. Mayall]. a review of the interaction between design and specification and the use and development of mechanized methods : proceedings of a symposium by the Institution of Civil Engineers and the Institution of Highway Engineers held on 17 February, 1972 in London /