
- Author: Dipl.-Ing. Prof. P. Ostertag (auth.)
- Language: German
- Year: 1913

- Author: Dipl.-Ing. Prof. P. Ostertag (auth.)
- Language: German
- Year: 1933

- Author: Dipl-Ing. Prof. P. Ostertag (auth.)
- Language: German
- Year: 1924

- Author: Dipl.-Ing. Prof. P. Ostertag (auth.)
- Language: German
- Year: 1913