Description based on: 2. época, año 2, no. 15 (2. decena de abr. de 1921); title from cover.
Latest issue consulted: 2. época, año 2, no. 27 (1. quincena de dic. 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 23).