Description based on: Núm. 7 (agosto 4 de 1921); title from caption.
Latest issue consulted: Núm. 14 (oct. 8 de 1921).
Microfilm. Leiden, The Netherlands : IDC Publishers, 1999. on 1 microfilm reel with other items ; 35 mm. (Latin American anarchist and labour periodicals, 1880-1940 ; reel 98).