Papers, 1915-2000, relating to background research by Rob Evans for his book, Gassed: British chemical warfare experiments on humans at Porton Down (House of Stratus, London, 2000), including: copy Public Record Office papers, 1915-1919, relating to the development and use of poison gas on the Western Front, World War One; copy Public Record Office papers relating to meetings of the Chemical Defence Advisory Board of the Advisory Council on Scientific Research and Technical Development, 1947-1968; copy Public Record Office papers relating to the testing of lysergic acid diethylamide (LSD), 1954-1967; Porton Down annual reports, 1991-1994; Public Record Office papers on the testing of V class nerve agents, 1961-1964; copy Public Record Office papers, 1921-1953, on the use of tear gas in the British Empire; papers on the development and use of CS tear gas, 1919-2000; papers on the use of pepper spray, 1922-1999; copy Public Record Office papers on the testing of radioactive material, 1956-1964; Public Record Office papers relating to biological warfare trials, 1953-1977; transcripts of interviews done by Observer Films for ITV documentary, Secrets of Porton Down , broadcast 1994; copies of parliamentary answers relating to chemical testing on volunteers, 1995-2000