Fanny Isensee is research assistant and PhD student at the History of Education Department at the Institute of Education Studies, Humboldt-Universität zu Berlin.Andreas Oberdorf is permanent lecturer in theory and history of education and supervisor of the research library of the Center for German-American Educational History at the Institute of Education, University of Münster, Germany.Daniel Töpper is research assistant and PhD student at the History of Education Department at the Institute of Education Studies, Humboldt-Universität zu Berlin.