File:Friedrich Mercks 1920.jpg
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![File:Friedrich Mercks 1920.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/a/a7/Friedrich_Mercks_1920.jpg/458px-Friedrich_Mercks_1920.jpg?20181225083521)
Size of this preview: 458 × 600 pixels. Other resolutions: 183 × 240 pixels | 366 × 480 pixels | 586 × 768 pixels | 782 × 1,024 pixels | 1,858 × 2,434 pixels.
Original file (1,858 × 2,434 pixels, file size: 3.43 MB, MIME type: image/jpeg)