Missionary construction technician, 1901-1908 in Windhoek, Karibib, Okahandja, Otjimbingue, Rehoboth; letters and work reports, 1901-1909; curriculum vitae, certificates, 1899-1901; instruction for Johann Jacob Diehl, 1901; construction report of the Windhoek Mission Church, 1902; report on the visit to the station building in Otjizewa, 1903; proposals for e. Building regulations for the Herero Conference, 1906;

Wie Südwestafrika deutsch wurde, Eberhard Diehl, 6 p., ms., c. 1934; From the curriculum vitae and diary of missionary Philipp Diehl, (Okahandja 1868-1904), Gustav Weth, 16 p., ms., Fragment, c. 1950;

in Worcester, Rehoboth, Okahandja, Swakopmund, Lüderitz; Berichte, Rundbriefe an Freunde u. Beter in d. Heimat, 1929-1935; Lebenslauf, Zeugnisse u. Ärztliche Befundberichte, 1929-1937

Missionary craftsman, missionary farmer, 1912-1915 Karibib; curriculum vitae, application, certificates, instruction, 1911-1912; letters from Okahandja and Karibib, 1912-1914;