Paper originally presented at the Segundo Congreso de la Asociación Mundial de Centros de Estudios Históricos y Sociales del Movimiento Obrero (AMCEHSMO), held in Mexico City, Oct. 15-19, 1979, under the title: El Primero de mayo de 1913. Annexes (p. 89-185) includes articles, speeches, etc. written by various authors. Includes bibliographies.
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