Morelia: Trabajadores Industriales del Mundo, ca. 1940s?]. First Thus. Octavo (23.5cm.); original white decorative staplebound wrappers; 23pp. Very minimal wear from handling, else Very Good or better. Text entirely in Spanish. Mexican edition of One Big Union. Headquarters address on title page: 2422 Halsted St. North, Chicago, the IWW's address, 1934-1970. OCLC locates five copies (though erroneously dating the pamphlet ca. 1920s), at UC Davis, Northwestern, Michigan State, U Michigan, and Duke.