School and Cambridge papers, 1909-19; family letters, c.1910-27; copy letters, miscellaneous letters, and correspondence in India, 1915-19; papers about Malaya, 1924-26; photographs of Malaya and India; letters and papers on his ministry, 1928-38; Westminster College papers and lecture notes, 1938-63; letters and papers as Moderator, 1949-50; University sermons, 1944-61; Presbyterian Historical Society, essays, lectures, broadcasts, and conferences; schemes of union (Presbyterian Church of England/Free Churches, discussions, c.1933-38; Congregational/Presbyterian relations, 1944-48; and Anglican/Presbyterian relations, 1954-57); general reunion papers, c.1946-72; Presbyterian laymen's conferences, Doctrine Committee, Presbyter Committee, and World Presbyterian Alliance, c.1947-67; and World Council of Churches and British Council of Churches, 1930s-1970s.