Correspondence, press cuttings and related items, including letters from Reinhold Niebuhr, David Smith Cairns William Temple (the Archbishop of Canterbury), the Duke of Montrose and various publishers. Much of the correspondence relates to Church of Scotland business, including John Baillie's appointment as Moderator Designate of the General Assembly of the Church of Scotland and as Corresponding Member of the General Assembly of the Presbyterian Church in Ireland.

Correspondence and related items received by John Baillie while he was in France with the YMCA, from friends, colleagues in others in (mostly) Britain, the United States and Canada and including the solicitors handling Richard Fowler's estate, his cousin Elizabeth Catherine (Elsa) Gallant, his brother Donald Macpherson Baillie, his cousin Ian Anderson, Reinhold Niebuhr, George Freeland Barbour and various publishers.

Correspondence, press cuttings and related items for the period of and around John Baillie's visit to the United States immediately at the end of the Second World War and including letters from his wife Florence Jewel Baillie, his brother Donald Macpherson Baillie, publishers, Reinhold Niebuhr and Mathew Willard Lampe (State University of Iowa).