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-->Economics-->Transportation and communications
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Transportation and communications(HE1-HE9990)
Freight (General)(HE199-HE199.5)
Passenger traffic (General)(HE199.9-HE199.9)
Urban transportation(HE305-HE311)
Transportation geography. Trade routes(HE323-HE328)
Traffic engineering. Roads and highways. Streets(HE331-HE380)
Water transportation(HE380.8-HE971)
Railways(HE1001-HE5600)
Automotive transportation(HE5601-HE5725)
Stage lines.(HE5746-HE5749)
Ferries(HE5751-HE5870)
Express service(HE5880-HE5990)
Postal service. Stamp collecting(HE6000-HE7500)
Telecommunication industry. Telegraph(HE7511-HE8700.9)
Telephone industry(HE8701-HE9680.7)
Cekkular telephone services industry. Wireless telephone industry(HE9713-HE9715)
Artificial satellite telecommunications(HE9719-HE9721)
Signaling(HE9723-HE9737)
Messenger service(HE9751-HE9756)
Air transportation(HE9761-HE9900)