- Volume 1: The Christian Roman Empire and the Foundation of the Teutonic Kingdoms (1911)
- Volume 2: The Rise of the Saracens and the Foundation of the Western Empire (1913
- Volume 3: Germany and the Western Empire (1922)
- Volume 4: The Eastern Roman Empire 717–1453 (1923)
- Volume 5: Contest of Empire and Papacy (1926)
- Volume 6: Victory of the Papacy (1929)
- Volume 7: Decline of Empire and Papacy (1932)
- Volume 8: The close of the Middle Ages (1936)
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