During their scientific and research work, the team of the Pilecki Institute carried out numerous enquiries in both Polish and foreign archives, making it possible to create a list of sources (including photographs, documents, court files and passports) that were used in reconstructing the subsequent stages of the passport campaign. We also gather information about publications, books and articles devoted to this subject. We publish and make available our own scientific studies. As part of the Witnesses to the Age project, we build our own oral history archive. We want to share these materials and encourage you to expand your knowledge about the activities of the Ładoś Group and the holders of passports issued by them.