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(21 classifications)
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Social sciences
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Transportation and communications
Classifications (LC)
Air transportation. Airlines
(8)
Artificial satellite telecommunications
(2)
Automotive transportation
(14)
Bicycles
(1)
By region or country
(1)
Cellular telephone services industry. Wireless telephone industry
(11)
Electronic mail systems
(1)
Online information services
(1)
Periodicals. Societies. Serials
(2)
Postal service
(1)
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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