Wilhelm Conrad Roentgen. c.1901 (55-56 years old).
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Author: Fotogravyr General Stabens Litografiska Anstalt
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Original file: https://commons.wikimedia.org/wiki/Wilhelm_Conrad_R%C3%B6ntgen#/media/File:Wilhelm_Conrad_R%C3%B6ntgen.jpg
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Modifications: none
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License: Public domain