Bereitstellung von Tributarbeiter für den Telegrafendurchbau nach Kribi entlang der Küste. - Report by Lieutenant von Sobbe, Edea, 5 September 1904 [fol. 98 - 99] Construction of telephone and telegraph connections. - Duala - Jabassi, 1904 Construction of telephone and telegraph connections. - Recruitment and provision of workers for the construction, operation and maintenance of telegraph and telephone lines in the Cameroon Protectorate, 1889 - 1908 Construction of telephone and telegraph lines. - Duala - Edea, 1902 - 1903 Construction of telephone and telegraph lines. - Kribi - Lolodorf - Jaunde - Akonolinga and plans for the continuation Lomie - Molundu, 1904 - 1908