1 "Ficheiro:Social_progress_in_contemporary_Europe_(IA_socialprogressin00oggf).pdf".

Ficheiro:Social progress in contemporary Europe (IA socialprogressin00oggf).pdf

recordings.PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:Social_progress_in_contemporary_Europe_(IA_socialprogressin00oggf).pdf...