File:Equals1968Koch.jpg
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![File:Equals1968Koch.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Equals1968Koch.jpg/393px-Equals1968Koch.jpg?20160424095107)
Size of this preview: 393 × 599 pixels. Other resolutions: 157 × 240 pixels | 315 × 480 pixels | 504 × 768 pixels | 672 × 1,024 pixels | 2,425 × 3,696 pixels.
Original file (2,425 × 3,696 pixels, file size: 1.34 MB, MIME type: image/jpeg)