- Author: Ulrich Conrads
- Language: English
- Year: 1975
- Author: Ulrich Conrads
- Language: German
- Year: 2007
- Author: Ulrich Conrads
- Language: German
- Year: 2000
Otto Steidle
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- Author: Manfred Sack (auth.) Ulrich Conrads Manfred Sack (eds.)
- Language: German
- Year: 1985
- Author: Günther Kühne (auth.) Ulrich Conrads Manfred Sack (eds.)
- Language: German
- Year: 1983
- Author: Hermann Fehling Daniel Gogel (auth.) Ulrich Conrads Manfred Sack (eds.)
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- Year: 1981
- Author: Ulrich Conrads
- Language: English
- Author: Ulrich Conrads (auth.)
- Language: German
- Year: 2007