Place of publication varies: Mexico City, 1900-<Oct. 7, 1901>; San Antonio, Tex., Nov. 5, 1904-Feb. 18, 1905; St. Louis, Missouri, Feb. 25-<Oct 7, 1905>; Los Angeles, Calif., Sept. 3, 1910-1918.
Editors: Ricardo Flores Magón, Jesús Flores Magón and Enrique Flores Magón with Antonio Horcasitas and others.
Title from caption.
"Semanal revolucionario."
In Spanish; some English.
Latest issue consulted: Época IV, numero 260 (6 de octubre de 1917).