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Associations Unlimited - Encyclopedia of Associations series contains information on international, national, regional, state, and local nonprofit membership organizations in all fields. Provides description, contact information, IRS data, SIC codes, as well as meetings and publications information.
ProQuest Historical Newspapers - Atlanta Constitution, Baltimore Sun, Boston Globe, Chicago Defender, Chicago Tribune, Christian Science Monitor, Los Angeles Times, New York Times, Wall Street Journal, Washington Post (Years of coverage varies, but usually includes nineteenth, twentieth and twenty-first centuries).