Secondary labour force of permanent staff? Foreign workers in the Aachen coal mines. TSEG - The Low Countries Journal of Social and Economic History, [S. l.], v. 5, n. 3, p. 126–154, 2008. DOI: 10.18352/tseg.534. Disponível em: https://tseg.nl/article/view/7804.. Acesso em: 3 jul. 2024.