Books by G. Beckmann:
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Beckmann, G. (Gustav), 1864-: Der Kampf Kaiser Sigmunds Gegen die Werdende Weltmacht der Osmanen, 1392-1437: Eine Historische Grundlegung (in German; Gotha: F. A. Perthes, 1902)
Additional books by G. Beckmann in the extended shelves:
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Beckmann, G. (Gustav), 1864-: Concilium basiliense. (R. Reich, 1896), also by Switzerland) Council of Basel (1431-1449 : Basel, H. Herre, Giulio Coggiola, Rudolf Wackernagel, Johannes Haller, and Historische und Antiquarische Gesellschaft zu Basel (page images at HathiTrust)- Beckmann, G. (Gustav), 1864-: Concilium Basiliense; Studien und Quellen zur Geschichte des Concils von Basel (Kraus Reprint, 1971), also by Switzerland) Council of Basel (1431-1449 : Basel, Heinrich Dannenbauer, H. Herre, Johannes Haller, and Historische und Antiquarische Gesellschaft zu Basel (page images at HathiTrust)
Find more by G. Beckmann at your library, or elsewhere.