Appelbaum Stalin

I'm a big World War II buff, and in addition to all of the books I own about the battles, campaigns, weaponry, and general histories of the war, I also own many biographies and autobiographies of people, both famous and unknown, from the era. However, one thing I lacked was a good biography of Stalin. I have a few, but they were written before the Iron Curtain had fallen, and primarily used "western" rather than Soviet sources.