000 - Computer science, information & general works 1 006 - Special computer methods 1 111 - Ontology 1 140 - Specific philosophical schools 1 300 - Social sciences 47 301 - Sociology & anthropology 3 304 - Factors affecting social behavior 2 305 - Social groups 1 320 - Political science 134 327 - International relations 1 330 - Economics 141 333 - Economics of land & energy 63 336 - Public finance 1 338 - Production 9 340 - Law 36 342 - Constitutional & administrative law 2 344 - Labor, social, education & cultural law 11 346 - Private law 1 363 - Other social problems & services 39 371 - Schools & their activities; special education 2 500 - Natural sciences & mathematics 2 509 - Historical, geographic & persons treatment 1 519 - Probabilities & applied mathematics 7 520 - Astronomy & allied sciences 1 526 - Mathematical geography 1 539 - Modern physics 2 540 - Chemistry & allied sciences 1 541 - Physical chemistry 3 543 - Analytical chemistry 1 546 - Inorganic chemistry 1 549 - Mineralogy 2 550 - Earth sciences 7 551 - Geology, hydrology & meteorology 17 570 - Life sciences; biology 5 571 - Physiology & related subjects 52 572 - Biochemistry 8 574 - [Unassigned] 2 576 - Genetics & evolution 2 577 - Ecology 142 578 - Natural history of organisms 5 579 - Microorganisms, fungi & algae 23 580 - Plants (Botany) 110 581 - Specific topics in natural history 47 582 - Plants noted for characteristics & flowers 9 590 - Animals (Zoology) 7 591 - Specific topics in natural history 1 595 - Arthropods 8 600 - Technology 6 610 - Medicine & health 5 612 - Human physiology 2 more ...