Documents, photographs, witness statements, films and all sources systematically collected by Porta Polonica are digitized and recorded in a database.
Fig. 3: Information board on economic migration in the German Empire
Information board of the City of Bochum on economic migration in the German Empire, with a picture of the Polish association Heiliger Josef in the Dahlhausen district
John à Lasco/Jan Łaski: Defensio Verae semperque In Ecclesia Receptae Doctrinæ De Christi Domini incarnatione, Adversus Mennonem Simonis Anabaptistarum Doctorem, Bonn 1545