- Author: D. A. Rowlands
- Language: English
- Year: 2020
- Author: Bernard Maitte
- Language: French
- Year: 2015
- Author: EDUCATIONAL DEVELOPMENT CENTER Inc.
- Language: Norwegian
- Year: 1974
- Author: Joseph Petzval
- Language: German
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Abhandlungen
pdf
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- Language: German
- Year: 1907
- Author: August Toepler Alexander Witting (ed.)
- Language: German
- Year: 1906
- Author: August Toepler Alexander Witting (ed.)
- Language: German
- Year: 1906