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- Language: German
- Year: 1990

- Author: Dieter Spaar
- Language: German
- Year: 1978

- Author: Prof. Dr. Drs. h. c. Dieter Spaar Prof. Dr. sc. Helmut Kleinhempel Prof. Dr. sc. Rolf Fritzsche (auth.)
- Language: German
- Year: 1990

- Author: Prof. Dr. Dr. h. c. Dieter Spaar Prof. Dr. sc. Helmut Kleinhempel Prof. Dr. sc. Rolf Fritzsche (auth.)
- Language: German
- Year: 1989

- Author: Prof. Dr. Dr. h. c. Dieter Spaar Prof. Dr. sc. Helmut Kleinhempel Prof. Dr. sc. Rolf Fritzsche (auth.)
- Language: German
- Year: 1988

Kartoffeln
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- Author: Prof. Dr. Dieter Spaar Prof. Dr. sc. Helmut Kleinhempel Prof. Dr. sc. Rolf Fritzsche (auth.)
- Language: German
- Year: 1987