Notes, Correspondence and Papers - 'Innovation in Construction' Conference Notes, papers and correspondence relating to the Construction History Society seminar 'Innovation in Construction', held on 17th August 1986, and to which David Medd contributed by speaking on post-war Hertfordshire schools. Included in the file is a pamphlet about The Cement and Concrete Association, and, an abridged version of 'Innovation in Structural Theory in the Nineteenth Century' by Professor TM Charlton. 1986