Curriculum vitae, copies of certificates, instructions, vows of secondment, 1934; Medical questionnaire for Teophil Hopf and Ruth Johanssen (his bride), 1934-1935; Engagement announcement Hopf-Johanssen, 1935; correspondence and reports by Mr and Mrs Hopf, 1933-1940; Report on the work in the Ihangirob area and in the Ihangirob region. Ngote, 1936-1937; A holiday trip to the islands by Ruth Hopf,, 1938; correspondence with the Hopf couple during internment, 1940-1947; instructions for Theophil Hopf as accountant, 1954; correspondence with Teophil Hopf, 1948-1970; travel reports from Africa, by Theophil Hopf, 1961-1962