- Author: Joseph Alexander von Helfert
- Language: German
- Year: 1862
- Author: Joseph Alexander von Helfert
- Language: German
- Year: 1873
- Author: Joseph Alexander von Helfert
- Language: German
- Year: 1886
- Author: Joseph Alexander von Helfert
- Language: German
- Year: 1886
- Author: Joseph Alexander von Helfert
- Language: German
- Year: 1876
- Author: Joseph Alexander von Helfert
- Language: German
- Year: 1872
- Author: Joseph Alexander von Helfert
- Language: German
- Year: 1870
- Author: Joseph Alexander von Helfert
- Language: German
- Year: 1869
- Author: Joseph Alexander von Helfert
- Language: German
- Year: 1863