File:Gustav Theodor Fechner (1801-1887) middle aged.jpg
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Size of this preview: 489 × 600 pixels. Other resolutions: 196 × 240 pixels | 391 × 480 pixels | 626 × 768 pixels | 835 × 1,024 pixels | 1,669 × 2,048 pixels | 2,572 × 3,155 pixels.
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