Import, export and transit trade of Amsterdam and Rotterdam together in 1938 MakerArntz, GerdCollectieArchief Gerd Arntz
Import and export of goods in percent of national income in 1938 MakerArntz, GerdCollectieArchief Gerd Arntz
Production Indices and Relative Importance of the Manufacturing and Mining Branches of Industry MakerArntz, GerdCollectieArchief Gerd Arntz