"Radical Border Crossers: The Industrial Workers of the World and their Press in Latin America" (E.I.A.L. article), 2012, Box: 1, Folder: 13. Personal papers of Anton Rosenthal, PP 633. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/501921 Accessed January 17, 2025.