1
Έκδοση 1950
“...United Nations. Department of Economic Affairs...”
Βιβλίο
2
Έκδοση 1954
“...United Nations. Department of Economic Affairs,...”
Βιβλίο
3
Έκδοση 1948
“...United Nations. Department of Economic Affairs. Division of Transport and Communications...”
Βιβλίο