Contract between the naval architect Troschel and the company C. Vering concerning sand delivery for the big harbour (contract collection no. 10) Add to clipboard BArch, RM 3/7100 File 1905 Part of Federal Archives (Archivtektonik) In: Shipyard and harbour affairs in Tsingtau German Imperial Naval Office
Contract with Siemens-Schuckert for the extension of the Tsingtau power station for the connection of the floating dock (contract collection no. 2) Add to clipboard BArch, RM 3/7098 File 1904-1905 Part of Federal Archives (Archivtektonik) In: Measures for economic development and development German Imperial Naval Office
Contract with the company C. Vering concerning port construction works in Kiautschou Bay (Collection of contracts No. 1) Add to clipboard BArch, RM 3/7097 File 1902 Part of Federal Archives (Archivtektonik) In: Shipyard and harbour affairs in Tsingtau German Imperial Naval Office