Correspondence and related items, including letters from his brother Donald Macpherson Baillie, Mona Anderson, Reinhold Niebuhr, Lewis Legertwood Legg Cameron, George Simpson Duncan, (Henry) Christopher Dawson and Garfield Hodder Williams. Also material relating to the preperation of the British Council of Churches visit to Germany and salaries at the University of Edinburgh.

Correspondence, itineraries, press cuttings and related items, including letters from his brother Donald Macpherson Baillie, Mona Anderson, the Duke of Montrose, William Temple (the Archbishop of Canterbury), George Simpson Duncan, Lewis Legertwood Legg Cameron and Sir Neil John Kennedy Cochran-Patrick. Much of the correspondence relates to Church of Scotland business, particularly visits to churches and congregations as Moderator as well as to John Baillie's BBC radio broadcasts.

Correspondence and related items, including letters from his wife Florence Jewel Baillie, Reinhold Niebuhr, Lewis Legertwood Legg Cameron, Hector Hetherington and Frank Moore. Also material relating to John Baillie's appointment as Chaplain to the King.