Columbia subject headings:
Harvard subject headings:
Freight and freightage--Europe--Communication systems--Congresses.
Shipment of goods--Data processing--Congresses.
Shipment of goods--Europe--Data processing--Congresses.
Princeton subject headings:
Data transmission systems--Europe--Congresses.
Freight and freightage--Europe--Communication systems--Congresses.
Information technology--Europe--Congresses.
Shipment of goods--Europe--Communication systems--Congresses.
Telecommunication--Europe--Apparatus and supplies--Valuation--Congresses.