Classification
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343 - Military, tax, trade & industrial law
1
360 - Social problems & services; associations
1
363 - Other social problems & services
1
370 - Education
1
417 - Dialectology & historical linguistics
1
501 - Philosophy & theory
1
509 - Historical, geographic & persons treatment
1
510 - Mathematics
1
600 - Technology
1
670 - Manufacturing
1
791 - Public performances
1
900 - History & geography
1