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![]() BRAGG, Sir William Henry (1862-1942). Physicist, discoverer of X-ray crystallography. Autograph Letter Signed to Mrs Berridge, 1 page 8vo (unevenly torn at the right hand side, not affecting the text), Royal Institution, 25 April no year. Thanking her for a book ('Some of my research assistants are deeply immersed in it already, and are enjoying it thoroughly'). [No: 21866]
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