Carroll & Graf
While I was in Alaska, I read Alfred Lansing's terrific Endurance, his history of Ernest Shackleton's polar expedition and escape, and right now, I'm reading (partly inspired by Ta-Nehisi) Battle Cry of Freedom. They're both fascinating experiments in use of primary sources. Lansing's book couldn't exist in the form it does without the diaries kept by crew members on Shackleton's expedition. And while Battle Cry of Freedom is primarily a survey history, it relies on a number of diaries and letters to pull us into the narrative on a gut level.