Hi Susan. Yes, this book is from Twain's own library at Stormfield, as confirmed by its red accession number. I want to believe he used it - he was an admirer of Fiske - but all I have to go on are some pencil marks made against certain sentences throughout the book. This was something he often did in his books. One sentence in this book reads, "At a time when there was as yet no English literature for the common people, this untold wealth of Hebrew literature was implanted in the English mind as in a virgin soil." But there is no other marginalia. The book was published in 1889, and was purchased from Brown & Gross Booksellers, Hartford, CT. Heather.