Dewey Decimal System: 21st edition
000 | 100 | 200 | 300 | 400 | 500 | 600 | 700 | 800 | 900
500 Natural sciences & mathematics
501 Philosophy & theory
502 Miscellany
503 Dictionaries & encyclopedias
504 Not assigned or no longer used
505 Serial publications
506 Organizations & management
507 Education, research, related topics
508 Natural history
509 Historical, areas, persons treatment
510 Mathematics
511 General principles
512
Algebra &
number theory
513
Arithmetic
514
Topology
515 Analysis
516
Geometry
517 Not assigned or no longer used
518 Not assigned or no longer used
519
Probabilities & applied mathematics
520 Astronomy & allied sciences
521 Celestial mechanics
522 Techniques, equipment, materials
523 Specific celestial bodies & phenomena
524 Not assigned or no longer used
525 Earth (Astronomical geography)
526 Mathematical geography
527 Celestial navigation
528
Ephemerides
529 Chronology
530 Physics
531 Classical mechanics Solid mechanics
532 Fluid mechanics Liquid mechanics
533
Pneumatics (Gas mechanics)
534 Sound & related vibrations
535 Light &
paraphotic phenomena
536 Heat
537
Electricity & electronics
538
Magnetism
539 Modern physics
540 Chemistry & allied sciences
541 Physical & theoretical chemistry
542 Techniques, equipment, materials
543 Analytical chemistry
544 Qualitative analysis
545 Quantitative analysis
546
Inorganic chemistry
547
Organic chemistry
548
Crystallography
549
Mineralogy
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 other areas
560 Paleontology Paleozoology
561
Paleobotany, fossil microorganisms
562
Fossil invertebrates
563 Other fossil invertebrates
564 Fossil
Mollusca &
Molluscoidea
565 Fossil
Arthropoda
566 Fossil
Chordata
567 Fossil cold-blooded vertebrates
568 Fossil
Aves (Fossil birds)
569 Fossil
Mammalia
570 Life sciences
571
Physiology & related subjects
572
Biochemistry
573 Specific systems in animals
574 Not assigned or no longer used
575 Specific parts of and systems in plants
576
Evolution &
genetics
577
Ecology
578 Natural history of organisms
579 Microorganisims,
fungi,
algae
580 Plants
581 Specific topics in natural history
582 Plants noted for characteristics & flowers
583
Magnoliopsida (
Dicotyledons)
584
Liliopsida (
Monocotyledons)
585
Pinophyta (
Gymnosperms)
Coniferales
586
Cryptogamia (Seedless plants)
587
Pteridophyta (Vascular seedless plants)
588
Bryophyta
589 Not assigned or no longer used
590 Animals
591 Specific topics in natural history
592 Invertebrates
593 Marine & seashore invertebrates
594
Mollusca &
Molluscoidea
595
Arthropoda
596
Chordata
597 Cold-blooded vertebrates Fishes
598 Aves (Birds)
599 Mammalia (Mammals)