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(22 classifications)

Classifications (LC)
Air transportation. Airlines (14)
Artificial satellite telecommunications (2)
Automotive transportation (14)
Bicycles (1)
By region or country (1)
Cellular telephone services industry. Wireless telephone industry (11)
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Railroads (16)
Research (4)
Statistics (1)
Study and teaching (1)
Telecommunication industry. Telegraph (15)
Telephone industry (1)
Theory. Method. Relation to other subjects (5)
Traffic engineering (15)
Transportation safety. Transportation accidents (2)
Urban transportation (2)
Water transportation (26)

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