Markham Colliery Engineering Department engineering drawings The engineering drawings (784 items) are mostly for machinery and equipment used in the colliery. They are stored in three map cabinets. There is a finding aid to show plans what there were, including those which are held in cabinets 2 and 3, together with a photocopy of pages from it indicating which plans actually arrived in the Derbyshire Record Office. This finding aid is the basis for the DRO catalogue entries. [mid-late 20th cent]