I'm always scouting out places to find interesting old books and papers to use in some of my work. Recently I revisited a favorite haunt here in Boston, the venerable Brattle Book Shop. Its tucked away at 9 West Street in Downtown Boston and is a terrific source of wonders. They have outside stalls with all sorts of things. And when you venture indoors you find a multi-floor warren of books, papers, periodicals and postcards.