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- Safari Books Online (Firm)594
- Deutsche Akademie der Wissenschaften zu Berlin58
- Helmholtz, Hermann von, 1821-189452
- Ostwald, Wilhelm, 1853-193249
- Planck, Max, 1858-194741
- Humboldt, Alexander von, 1769-185939
- Faber Birren Collection (Yale University)37
- Liebig, Justus, Freiherr von, 1803-187336
- Einstein, Albert, 1879-195535
- Röntgen, Wilhelm Conrad, 1845-192334
- Blaschke, Wilhelm, 1885-196231
- Gauss, Carl Friedrich, 1777-185531
- Haeckel, Ernst Heinrich Philipp August, 1834-191931
- Hilbert, David, 1862-194330
- Centre national de la recherche scientifique (France)29
- Klein, Felix, 1849-192529
- Schulten, Lars29
- Hertwig, Oscar, 1849-192228
- Demmig, Thomas27
- Kowalewski, Gerhard, 1876-195024