languages 494 Altic, Uralic, Hyperborean, Dravidian languages, miscellaneous languages of south Asia 495 Languages of East and Southeast Asia 496 African languages 497 North American native languages 498 South American native languages 499 Non-Austronesian languages of Oceania, Austronesian languages, miscellaneous languages Class 500 – Science 500 Science 500 Natural sciences and mathematics 501 Philosophy and theory 502 Miscellany 503 Dictionaries, encyclopedias, concordances 504 Not assigned or no longer used 505 Serial publications 506 Organizations and management 507 Education, research, related topics 508 Natural history 509 History, geographic treatment, biography 510 Mathematics 510 Mathematics 511 General principles of mathematics 512 Algebra 513 Arithmetic 514 Topology 515 Analysis 516 Geometry 517 Not assigned or no longer used 518 Numerical analysis 519 Probabilities and applied mathematics 520 Astronomy 520 Astronomy and allied sciences 521 Celestial mechanics 522 Techniques, procedures, apparatus, equipment, materials 523 Specific celestial bodies and phenomena 524 Not assigned or no longer used 525 Earth (Astronomical geography) 526 Mathematical geography 527 Celestial navigation 528 Ephemerides 529 Chronology 530 Physics 530 Physics 531 Classical mechanics 532 Fluid mechanics 533 Pneumatics (Gas mechanics) 534 Sound and related vibrations 535 Light and related radiation 536 Heat 537 Electricity and electronics 538 Magnetism 539 Modern physics 540 Chemistry 540 Chemistry and allied sciences 541 Physical chemistry 542 Techniques, procedures, apparatus, equipment, materials 543 Analytical chemistry 544 No longer used — formerly "Qualitative analysis" 545 No longer used — formerly "Quantitative analysis" 546 Inorganic chemistry 547 Organic chemistry 548 Crystallography 549 Mineralogy 550 Earth sciences and geology 550 Earth sciences 551 Geology, hydrology, meteorology 552 Petrology 553 Economic geology 554 Earth sciences of Europe 555 Earth sciences of Asia 556 Earth sciences of Africa 557 Earth sciences of North America 558 Earth sciences of South America 559 Earth sciences of Australasia, Pacific Ocean islands, Atlantic Ocean islands, Arctic islands, Antarctica, extraterrestrial worlds 560 Fossils and prehistoric life 560 Paleontology 561 Paleobotany, fossil microorganisms 562 Fossil invertebrates 563 Miscellaneous fossil marine and seashore invertebrates 564 Fossil Mollusca and Molluscoidea 565 Fossil Arthropoda 566 Fossil Chordata 567 Fossil cold-blooded vertebrates 568 Fossil Aves (birds) 569 Fossil Mammalia 570 Biology 570 Biology 571 Physiology and related subjects 572 Biochemistry 573 Specific physiological systems in animals, regional histology and physiology in animals 574 Not assigned or no longer used 575 Specific parts of and physiological systems in plants 576 Genetics and evolution 577 Ecology 578 Natural history of organisms and