insider.si.edu: William Crookes letter to Douglas Sladen, dated 7 Kensington Park Gardens, W., London, 5 February 1915
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insider.si.edu: William Crookes letter to Douglas Sladen, dated 7 Kensington Park Gardens, W., London, 5 February 1915
Captured 2026-08-17 from insider.si.edu. The archived copy is preserved so this citation survives link rot.