• 6 Memorial Library
• 5 Wisconsin Historical Society Library
• 1 Wisconsin Historical Society Archives

• 62 Journals, Magazines, Newspapers
• 2 Microforms
• 1 Books

• 12 Communism
• 8 Socialism
• 8 Working class
• 3 Labor movement
• 3 Libertarianism
• 3 Political activity
• 2 Anarchists
• 2 Feminism
• 2 Labor unions
• 2 Women's rights
• 1 Anarchisim
• 1 Arkiviu-Bibrioteka "T. Serra"
• 1 Bibliography
• 1 Bresci, Gaetano
• 1 Fascio rivoluzionario italiano
• 1 International Institute of Social History
• 1 Italian Americans
• 1 Italians
• 1 L'Azione (Group)
• 1 Latin American periodicals
• 1 Nettlau, Max, 1865-1944
• 1 Political violence
• 1 Politics and government
• 1 Refugees

• 2 Galleani, Luigi, 1861-1931
• 1 Arkiviu-Bibrioteka "T. Serra."
• 1 Armonia (Group)
• 1 Centro Internacional de Estudios Sociales (Montevideo, Uruguay)
• 1 Centro Libertario (São Paulo, Brazil)
• 1 Centro Socialista Obrero de Bahía Blanca
• 1 Centro studi libertari Pinelli
• 1 Comité de Agitación Pro Libertad de Sacco y Vanzetti
• 1 Fascio rivoluzionario italiano
• 1 Federazione anarchica italiana
• 1 Gruppo "Pensiero e Azione" (São Paulo, Brazil)
• 1 Gruppo Emma Goldman
• 1 Gruppo Lavoriamo
• 1 International Institute of Social History
• 1 L'Azione (Group)
• 1 Nettlau, Max, 1865-1944
• 1 Risurrezione (Group)
• 1 Sociedad de Resistencia Obreros Albañiles y Anexos de la Capital
• 1 Umanitá nova (Group)
• 1 Unione sindacale italiana. Comitato pro vittime politiche

• 25 Spanish
• 8 Unknown
• 6 Portuguese
• 3 French
• 2 English
• 1 Catalan
• 1 Dutch
• 1 German
• 1 Multiple languages
• 1 Russian
• 1 Yiddish

• 33 Argentina
• 12 Italy
• 7 Brazil
• 5 Uruguay
• 4 United States
• 2 Latin America
• 1 Bahia Blanca
• 1 Barre
• 1 Barre (Vt.)
• 1 Lynn
• 1 Lynn (Mass.)
• 1 Massachusetts
• 1 Sardinia
• 1 Saõ Paulo (State)
• 1 Turin
• 1 Turin (Italy)
• 1 Vermont

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