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German Federal Archives
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Contract between the naval architect Troschel and the company C. Vering conce...
Contract between the naval architect Troschel and the company C. Vering concerning sand delivery for the big harbour (contract collection no. 10)

Contract with Siemens-Schuckert for the extension of the Tsingtau power stati...
Contract with Siemens-Schuckert for the extension of the Tsingtau power station for the connection of the floating dock (contract collection no. 2)

Contract with the company C. Vering concerning port construction works in Kia...
Contract with the company C. Vering concerning port construction works in Kiautschou Bay (Collection of contracts No. 1)

Extension of the port of Duala. - Plans and cracks
Extension of the port of Duala. - Plans and cracks

Kiautschou Port Facilities: Vol. 3
Kiautschou Port Facilities: Vol. 3

Kiautschou Port Facilities: Vol. 4
Kiautschou Port Facilities: Vol. 4

Kiautschou Port Facilities: Vol. 7
Kiautschou Port Facilities: Vol. 7

Wireless (spark) telegraphy, connections with foreign countries. - Activity o...
Wireless (spark) telegraphy, connections with foreign countries. - Activity of the company for wireless telegraphy GmbH ("Telefunken"): Vol. 34