I've just discovered Robert Regan's 1976 article on "English Notes": A Book Mark Twain Abandoned. He mentions three extant portions of this lost manuscript, of which I have found two. The third. "Property in Opulent London", I have not found. It occurs to me, from descriptions in Regan's article, of his diaries, journals, and manuscripts created while working on this "book", that there may be material of a geographic nature. I know little of his first three trips to England and would like to include discussion of them on my twainsgeography web site. Perhaps someone may share a PDF of this obscure piece. I would be much obliged. Scott