1958, the Our Lady of the Angels School Fire occurred in the Humboldt Park area. The fire killed 92 students and three nuns; in response, fire safety improvements were made to public and private schools across the United States. April 13, 1992, billions of dollars in damage was caused by the Chicago Flood, when a hole was accidentally drilled into the long-abandoned (and mostly forgotten) Chicago Tunnel system, which was still connected to the basements of numerous buildings in the Loop. It flooded the central business district with 250 million US gallons (950,000 m3) of water from the Chicago River. A major environmental disaster occurred in July 1995, when a week of record high heat and humidity caused 739 heat-related deaths, mostly among isolated elderly poor and others without air conditioning. See also American urban history Bibliography of Chicago history Chicago in the 1930s Ethnic groups in Chicago; the larger groups have articles such as Poles in Chicago and History of African Americans in Chicago Political history of Chicago Roman Catholic Archdiocese of Chicago Timeline of Chicago history Citations Further reading For many topics the easiest way to start is with Janice L. Reiff, Ann Durkin Keating and James R. Grossman, eds. The Encyclopedia of Chicago (2004), with thorough coverage by scholars in 1120 pages of text, maps and photos. Abu-Lughod, Janet L. New York, Chicago, Los Angeles: America's Global Cities (U of Minnesota Press, 1999), Compares the three cities in terms of geography, economics and race from 1800 to 1990 Allswang, John. A House For All Peoples: Ethnic Politics In Chicago, 1890-1936. (1973). 213 pp. Andreas, A. T. History of Chicago. From the earliest period to the present time (1884) online v 1; online v 2; online v. 3 Ascoli, Peter Max. Julius Rosenwald: The Man Who Built Sears, Roebuck and Advanced the Cause of Black Education in the American South (2006) excerpt and text search Avrich, Paul. The Haymarket Tragedy (1984) excerpt and text search Bales, Richard F. The Great Chicago Fire and the Myth of Mrs. O'Leary's Cow. (2002). 338 pp. Barnard, Harry. "Eagle Forgotten": The Life of John Peter Altgeld (1938) Barrett, James. Work and Community in the Jungle: Chicago's Packinghouse Workers, 1894—1922 (1987), excerpt and text search Biles, Roger. Big City Boss in Depression and War: Mayor Edward J. Kelly of Chicago. (1984). 219 pp. Biles, Roger. Richard J. Daley: Politics, Race, and the Governing