Letters patent appointing Commissioners, 1811-1837; writ to swear in Commissioners and orders to summon juries, 1795-1827; solicitor's notes offering advice for legal cases and presentments, 1780-1845; minutes of the Commissioners, 1702-1811; registers of the Commissioners, 1702-1830; minutes of the proceedings of the Committee, 1831-1847; Chairman's business papers, 1821-1838; Committee reference books, 1832-1846; extracts from the Registers, 1702-1821; order of Court for the presentment of landowners and tenants within area of Commission, 1837; order to owners and occupiers to appear in Court regarding non-payment of rates, 1831-1832; presentments of jurors, 1746-1844; reports and petitions, 1703-1749; reports of Committees, 1750-1846; petitions, officer's reports and letters, 1750-1847; petitions to open drains into sewers, 1802-1824; petition books, 1838-1847; financial accounts, 1707-1847, including accounts of works expenditure; rate books, 1703-1846; tenders, specifications, agreements and contracts by and with tradesmen for work on the sewers, 1751-1846; report of the Committee in response to statements made in the Report of the Poor Law Commissioners on the 'sanitary condition of the labouring population of Great Britain', 1843; plans of drains and public sewers, and maps of the jurisdiction of the Commission with levels and sewers marked.

Papers of Professor William Cawthorne Unwin, 1856-1952, comprising correspondence, principally concerning engineering matters, 1856-1931, 1950,1952, notably with Edward Dean Adams, including the Niagra Falls Scheme, 1890-1929, Sir Benjamin Baker, including the Forth Bridge, dam schemes, 1882-1898, Sir William Fairbairn, including experiments, appointments, 1856-1874, Thomas Hardy, concerning astronomy, 1881, Imperial College, 1910-1926 (as representative of the Institution of Civil Engineers);
research papers, 1859-1924, notably Fay and Newall brakes, 1859, observations on the Thames, 1882-1883, Nile Project Committee, 1919, dam schemes, 1899-1905;
speeches and addresses to various institutions, including presidential addresses to the Institution of Civil Engineers, 1912, and Institution of Mechanical Engineers, 1916; engineering drawings, 1875-1906, of apparatus, machinery, sections of the Thames, Telok Ayer key wall, Singapore; two portraits of Unwin, undated;
additional material, comprising papers relating to Windsor Water Works arbitration, 1884; reports on compression gauges, 1886-1887; Birmingham dams, 1895; notes on dam theory, 1905; papers relating to Stockport water supply and Kinder Dam, 1905; notes relating to schemes for Niagra and central London.

Minutes of the Joint Drainage Committee, 1915-1916; minutes of the Wandle Valley Joint Sewerage Board, 1917-1962; minutes of Wandle Valley Main Drainage Authority, 1963-1965; Orders, 1960-1962; Members attendance books, 1928-1965; registers of documents sealed, 1917-1965; register of tenders, 1948-1965.

Papers, 1777-1782, relating to proceedings between Sir Martin Folkes, lord of the Manor of Wells, and George Chad and others, in the Court of King's Bench, concerning the harbour at Wells, annotated throughout and with sketches in the hand of Robert Mylne (see English Reports, XCIX, 589-91, 686-8). Includes a Report to the Commissioners for the Preservation of the Harbour of Wells by John Wooler, 7 Jul 1777; estimates for repair works submitted by Stephen West, [1781]; copy of the judgment of Lord Chief Justice Mansfield, [21 Nov 1782]; a memorandum in Mynle's hand headed 'Facts and Observations on Wells Harbour', with details dating from 1663; 5 maps, one by H.A. Biedermann (no.II) and one of the Wash (no. IV). The following printed matter is also included: April 28, 1781. Mr. Mylne's Report on his Survey of the Harbour (1781); The Report of John Smeaton, Engineer, upon the State and Condition of Wells Harbour (1782); and The Reports of Mess. Hodskinson, Grundy, Hogard and Nickalls on the State and Causes of the Decay of Wells Harbour (1782).

Records of the West Kent Main Sewerage Board, including Board minutes; Committee minutes including the Finance Committee, Superannuation Joint Committee and Works Committee; financial records including registers of agreements, register of mortgages and transfers and loans ledger; letter books; and minutes of proceedings of the West Kent Drainage Bill.

Letters Patent appointing Commissioners, 1691-1837; minutes, agendas and reports, 1659-1847; minutes and reports of other Committees including the Committee of Accounts, Committee for Improvement of the Sewers, Committee of Rates, Committee of Works and Occasional Committee; petitions and reports, 1683-1798; papers presented to the Court, 1777-1847; Surveyor's Reports of work performed by leave of the Court, 1809-1847; information and reports from the Clerk of Works on cases of surreptitious drainage, 1810-1848; Surveyor's Reports of Work done at the charge of the District, 1775-1848; journal of large works in progress, 1838-1848; contracts and specifications, 1811-1847; presentments (a 'Presentment of the Jurors' was required before work could be carried out or a rate levied. With a few exceptions the Westminster presentments consist of lists of owners or occupiers of land and houses on whom rates could be levied), 1668-1843; decrees, (decrees gave authority for the levying of rates for work on the sewers), 1675-1847; abstracts by the Clerk of Works of work performed on the sewers, recording the amount of time spent and materials used, serving as a check on the contractors' bills, 1810-1846; copies of letters and notices sent by order of the Commissioners, 1776-1848; financial accounts, 1701-1847, including contractor's bills and payments to workmen; rate books, 1703-1848; law suits and legal opinion, 1820-1840; registers of sewers and drains, 1812-1845, including new sewers; printed reports and papers, 1830-1849, including financial accounts, statements of income and expenditure, opinions of Counsel, reports by solicitors, reports of Surveyors, proposals for changes to the management and structure of the Commission, regulations and memorandums; maps and plans of properties, sewers, districts drained by specific sewers, maps of parishes and maps of London and Middlesex, 1762-1847.

Copy of Court Orders of Westminster Commission of Sewers, 7 and 28 June 1709, allowing Mrs Katherine Akrode to make a drain from her house in Butcher Row, Saint Clement Danes, into the sewer there, 28 June 1709.

Diaries of Edward Wilding, 1926-1929, comprising diary in four volumes, illustrated with photographs, postcards, etc, of voyage to South America and a journey to Corriented and Posada on the River Parana and its tributaries, 1926 and diary in five volumes, illustrated with photographs, postcards etc, of a voyage to South America and a journey up the River Parana and in northern and western Argentina, 1929.