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All these books are free to read: either they're distributed with a free license, or they're in the public domain.
These books are included in the Directory of Open Access Books. This means that they have been peer-reviewed and are of interest to scholars.
Rudolf Carnap (Author) and Christian Damböck (editor)
Acta Cusana. Quellen zur Lebensgeschichte des Nikolaus von Kues. Band I, Lieferung 4 (Indices)
Erich Meuthen and Hermann Hallauer, editors
Geschlechterdiversität und Selbstbestimmung in der Schule
Tamás Jules Fütty et al. (editors)
Briefkultur(en) in der deutschen Geschichtswissenschaft zwischen dem 19. und 21. Jahrhundert
Matthias Berg and Helmut Neuhaus, editors