Classes 500+

500 NATURAL SCIENCES
501 Philosophy. Theory. Research methods
502 Nature hand-books. Textbooks
503 Dictionaries. Reference books
504 Essays
505 Serial publications
506 Associations. Institutions. Meetings
507 Studies
508 Compilations. Polygraphies
508.1 Standards
508.3 Statistics. Tables
508.4 Maps
508.5 Museums. Archives. Collections. Exhibitions
508.6 Environmental protection. Nature conservation
508.61 Endangered species. Conservation areas
508.62 Soil, forest and wetland conservation
508.63 Aquatic conservation
508.64 Air conservation
509 History of the natural sciences
510 MATHEMATICS
510.1 Mathematical tables and formulae. Methods of calculation
510.88 Mathematics as a hobby and pastime
511 Set theory
512 Number theory. Arithmetic
513 Algebra
514 Geometry
515 Trigonometry
516 Analysis
518 Probability calculus
519 Other areas of mathematics
520 ASTRONOMY
521 The Universe. Cosmology. Cosmogony
522 Astronomical instruments. Measuring time
522.1 Astronomical instruments
522.3 Measuring time
523 Life in the Universe. Astrobiology
528 Star systems. Solar systems
529 Space research. Space travel. Space technology
529.1 UFOs. Unidentified phenomena in the atmosphere
530 PHYSICS
530.88 Physics as a hobby and pastime
531 General and theoretical physics
531.1 Relativity theory
531.2 Nuclear physics. Atomic physics. Molecular physics
531.3 Quantum theory. Quantum mechanics
532 Experimental physics
533 Mechanics
534 Heat
535 Sound. Acoustics. Mechanical vibration
536 Light. Optics. Colour. Radiation
537 Electricity. Magnetism
540 CHEMISTRY
540.88 Chemistry as a hobby and pastime
541 Theoretical chemistry
542 Experimental chemistry
543 Analytical chemistry
545 Inorganic chemistry
546 Organic chemistry. Chemistry of plastics
547 Applied chemistry
550 PHYSICAL CHEMISTRY
560 BIOCHEMISTRY
570 BIOLOGY
571 Biological philosophy
573 General biology
574 Ecology. Biogeography
575 Evolutionary biology
576 Genetics
579 General microbiology
580 BOTANY
582 Plant morphology. Plant anatomy
583 Plant physiology
584 Plant ecology
587 Systematic botany
587.1 Lower plants
587.11 Fungi
587.4 Vascular plants
588 Plant geography
590 ZOOLOGY
590.85 Zoological gardens
590.86 Animal protection
591 Ethology. Animal sociology
592 Animal morphology. Animal anatomy
593 Animal physiology
594 Animal ecology
597 Systematic zoology
597.6 Invertebrates
597.61 Insects
597.9 Vertebrates
597.91 Fish
597.92 Birds
597.93 Mammals
598 Animal geography