Das Mittelalter
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- Author: Dietrich Schäfer
- Language: German
- Year: 1926
- Author: Dietrich Schäfer
- Language: German
- Year: 1893
- Author: Dietrich Schäfer
- Language: German
- Year: 1902
- Author: Dietrich Schäfer Friedrich Techen (eds.)
- Language: German
- Year: 1913
- Author: Dietrich Schäfer Friedrich Techen (eds.)
- Language: German
- Year: 1910
- Author: Dietrich Schäfer (ed.)
- Language: German
- Year: 1899
- Author: Dietrich Schäfer (ed.)
- Language: German
- Year: 1905
- Author: Dietrich Schäfer (ed.)
- Language: German
- Year: 1890
- Author: Dietrich Schäfer (ed.)
- Language: German
- Year: 1894
- Author: Dietrich Schäfer (ed.)
- Language: German
- Year: 1888