Non-family correspondence This file is formed of loose correspondence found amongst Lockhart's papers, fitting imperfectly with the principal series identified in arrangement of his papers, but containing reference to both his professional and personal life. It includes both 'in' and 'out' letters on a variety of topics and has been arranged chronologically. Correspondents include friends and colleagues, and the subject matter often includes both personal and professional interests. 1930s - 1990s