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I came across this interesting advertisement from The Times, 2 May 1901, in which Sir Arthur is requesting officers' letters for his book.

Here is what I believe to be an unpublished photograph of Conan Doyle, with two unidentified officers in the field.

In the form of a lantern slide.



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This certainly shows that ACD was a large man - the fellow on the right looks a bit lugubrious.