Statistics for occurrence #1 of “Messrs. Sampson” in part 2.13, chapter 2.23 of Henry Morton Stanley, Dorothy Stanley, The Autobiography of Sir Henry Morton Stanley:

...ossible, and to reduce slave-trading to sly and secret exchanges of human chattels in isolated districts in the interior. The book In Darkest Africa was published in June by my usual publishers, Messrs. Sampson , Son & Co., and the Messrs. Scribners of New York brought it out in America. It was translated into French, German, Italian, Spanish, and Dutch, and in English it has had a sale of about one ...
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