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Roentgen (unit) - Wikipedia
Wilhelm Röntgen - Wikipedia
Wilhelm Conrad Roentgen | Biography, Discovery, X-Rays, & Facts ...
Wilhelm Conrad Röntgen – Biographical - NobelPrize.org
Roentgen | X-ray, Imaging, Diagnosis | Britannica
Discovery of X-Rays - World History Encyclopedia
Roentgen (unit) | Radiology Reference Article - Radiopaedia.org
Wilhelm Conrad Röntgen – Facts - NobelPrize.org
Physics History November 2001 - American Physical Society
Wilhelm Conrad Röntgen: The scientist and his discovery