I've read Meachem's books on Jefferson and Jackson and found them likely. He's obviously a good writer, but the detail is always lacking. With detail and Jefferson, it's hard to beat Dumas Malone's series on him. It's six volumes and about 3,300 pages, but each book does begin with a chronology of the events covered in that volume. If you get to Jackson, I've read the first volume of Robert Remini's three-part biography and found it quite good.