1. Partido Obrero de Unificaci'on Marxista Creator: From the Collection: Serge, Victor, 1890-1947 Published / Created: 1937-45 Call Number: GEN MSS 238 Container / Volume: Box 1, folder 63 Image Count: 14 Found in: Beinecke Rare Book and Manuscript Library > Victor Serge papers (GEN MSS 238) > Series I: Correspondence > GENERAL CORRESPONDENCE > Partido Obrero de Unificaci'on Marxista