File:Karl D. Pierson.jpg
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![File:Karl D. Pierson.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/f/fb/Karl_D._Pierson.jpg/428px-Karl_D._Pierson.jpg?20211214084955)
Size of this preview: 428 × 599 pixels. Other resolutions: 171 × 240 pixels | 343 × 480 pixels | 548 × 768 pixels | 731 × 1,024 pixels | 1,500 × 2,100 pixels.
Original file (1,500 × 2,100 pixels, file size: 1.2 MB, MIME type: image/jpeg)