1. William C. Clark, Jill Jäger, and Josee van Eijndhoven, “Acid Rain, Ozone Depletion, and Climate Change: An Historical Overview,” in Social Learning Group, Learning to Manage Global Environmental Risks, Vol. 1: A Comparative History of Social Responses to Climate Change, Ozone Depletion, and Acid Rain, pp. 29–30.
2. Charles Dickens, Bleak House (New York: Signet Classics, 2003), p. 3.
3. Charles Dickens, Hard Times (New York: Bantam Books, 1981, Bantam Classic Reissue edition), p. 114.
4. Michael Warren, “A Chronology of State Medicine, Public Health, Welfare and Related Services in Britain: 1066–1999,” www.chronology.ndo.co.uk/index.htm.
5. J. Black, “Intussuusception and the Great Smog of London, December 1952,” Archives of Disease in Childhood 2003, Vol. 88, pp. 1040–42.