File:Gustav Hilbert 19.jpg
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![File:Gustav Hilbert 19.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/b/b7/Gustav_Hilbert_19.jpg/553px-Gustav_Hilbert_19.jpg?20141108134142)
Size of this preview: 553 × 600 pixels. Other resolutions: 221 × 240 pixels | 443 × 480 pixels | 708 × 768 pixels | 944 × 1,024 pixels | 1,515 × 1,643 pixels.
Original file (1,515 × 1,643 pixels, file size: 1.33 MB, MIME type: image/jpeg)