500 - Natural sciences and mathematics 1,939
503 - Dictionaries & encyclopedias 653
509 - History, geographic treatment, biography 600
501 - Philosophy and theory 502
502 - Miscellany 364
507 - Education, research, related topics 357
508 - Natural history 176
504 - [Unassigned] 88
506 - Organizations and management 68
505 - Serial publications 37
142 - Critical philosophy 1
149 - Other philosophical systems and doctrines 1
401 - Philosophy and theory 1
510 - Mathematics 1
511 - General principles of mathematics 1
515 - Analysis 1
539 - Modern physics 1
574 - [Unassigned] 1
598 - Aves 1
621 - Applied physics 1