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Zarate, Rodrigo
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Seignobos, Charles
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Pi y Margall, Francisco
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Morato, Juan Jose
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Guérin, Daniel
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Kolontay, Alejandra
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Claudín, Fernando
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Nettlau, Max
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Toynbee, Arnold Joseph <1889-1975>
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Paniagua, Javier
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Besteiro, Julián
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Valverde, Carlos
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Marx, Karl <1818-1883>
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Shepherd, William Robert
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Leval, Gaston
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Vázquez de Prada, Valentín
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