Archibald Clark Kerr's personal correspondence with his parents John and Kate Louisa Clark Kerr, with his siblings Margaret ('Margie', 1872-195?), Struan Robertson ('Robin', 1876-1915), Kate (1878-1961), Mairi (d. 1908), Muriel ('Duttie', c.1880-1925) and Gwladys ('Gwladdie', 1883-1951), with his nieces, nephews and other family members, and with his wife Maria Teresa, nee Dias Salas ('Tita', ?1907-1987). Also includes Clark Kerr's personal and literary papers, including some personal diaries, financial and administrative papers, and papers relating to the Inverchapel Estate in Argyll.