Severn Trent Water Authority: unlisted records Unlisted accession, Nov 2011 See partial box list below Unlisted accession, Feb 2016 North Derbyshire Water Board: River Derwent Scheme Booklet, Aug 1973; Annual Inspection of Undertakings 1967-1972 (6 files); 'Engineering 100' Return of Water Undertakings, 1972; First Inspection of the Undertaking, 1963 Severn Trent Water Authority: Hydrometric Yearbook 1974-1975 (Parts 1 and 2); Bamford Water Treatment Works showing modernisation in the 1980s leaflet; Booklet. Severn Trent Engineering Carsington Water: Building for the 21st century [1990s] South Derbyshire Water Board: 'Engineering 100' Return of Water Undertakings, 1971, annotated with 1973 figures?; A review 1961-1974; Official Opening of Homesford Water Treatment Works Booklet 7 July 1970 Chesterfield, Bolsover and Clowne Water Board: Annual Inspection, 1963; Annual Statistical Tables, 1959; Annual Report on Water Treatment and Examinations, 1960 Derwent Valley Water Board: Plan of Rowsley Waterworks and mains layout, 1936 Chesterfield RDC: Plan of Sewer Layout for Stonebroom Industrial Estate [pre-1974] Unlisted accession, Jun 2018 Credit Note book, Nov 1975 - Mar 1984 Unlisted accession, Oct 2021 Map book, containing OS 1:1 3rd Ed. sheet 100 [c1889], 6 inch 1924 ed. sheets 12SW, 12SE, 1923 ed. 17NW, 1921 ed. 18NE, 1923 ed. 19NW, 17SE, 1921 ed. 18SW, 18SE, 18NE, 30NW; loose sheets 25:1 1922 ed. sheets 24 and 25 Maps 1-133; Maps 134-188; 2 grid reference maps (10 x 10) indexing maps 1-90 (Ringinglow to Bolsover) and 91-190 (Beeley Hilltop to Pinxton) ; Ordnance Survey sheets 24-25; and Maps 17-63 [19th-20th cent]