http://dewey.info/scheme/e22/
300
Social sciences
380
Commerce, communications & transportation
380
Commerce, communications & transportation
381
Commerce
382
International commerce
383
Postal communication
384
Communications; telecommunication
385
Railroad transportation
386
Inland waterway & ferry transportation
387
Water, air & space transportation
388
Transportation; ground transportation
389
Metrology & standardization
Dewey Decimal Classification: Summaries
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