| Unidentified photographer The spirit of Sir Arthur Conan Doyle n.d. Gelatin silver print Nationaal Archief of the Netherlands / National Archive of the Netherlands Spaarnestad Photo, fotonummer SFA002003392 LL/32744 The spirit of Sir Arthur Conan Doyle, according to his widow Lady Conan Doyle. The photo was taken during a session with the English Reverand Tweedale, with the help of the photographic medium Mr. Hope.
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