500
500 Natural Sciences and Mathemetics501 Philosophy & theory
502 Miscellany
503 Dictionaries & encyclopedias
504 [Unassigned]
505 Serial publications
506 Organizations & management
507 Education, research & related topics
508 Natural history
509 Historical, geographic & persons treatment
510 Mathematics
511 General principles of mathematics
512 Algebra
513 Arithmetic
514 Topology
515 Analysis
516 Geometry
517 [Unassigned]
518 Numerical analysis
519 Probabilities & applied mathematics
520 Astronomy & allied sciences
521 Celestial mechanics
522 Techniques, equipment & materials
523 Specific celestial bodies & phenomena
524 [Unassigned]
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 Gas mechanics
534 Sound & related vibrations
535 Light & infrared & ultraviolet phenomena
536 Heat
537 Electricity & electronics
538 Magnetism
539 Modern physics
540 Chemistry & allied sciences
541 Physical chemistry
542 Techniques, equipment & materials
543 Analytical chemistry
544 [Unassigned]
545 [Unassigned]
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 Fossil marine & seashore invertebrates
564 Fossil mollusks & molluscoids
565 Fossil arthropods
566 Fossil chordates
567 Fossil cold-blooded vertebrates; fossil fishes
568 Fossil birds
569 Fossil mammals
570 Life sciences; biology
571 Physiology & related subjects
572 Biochemistry
573 Specific physiological systems in animals
574 [Unassigned]
575 Specific parts of & systems in plants
576 Genetics & evolution
577 Ecology
578 Natural history of organisms
579 Microorganisms, fungi & algae
580 Plants (Botany)
581 Specific topics in natural history
582 Plants noted for characteristics & flowers
583 Dicotyledons
584 Monocotyledons
585 Gymnosperms; conifers
586 Seedless plants
587 Vascular seedless plants
588 Bryophytes
589 [Unassigned]
590 Animals (Zoology)
591 Specific topics in natural history
592 Invertebrates
593 Marine & seashore invertebrates
594 Mollusks & molluscoids
595 Arthropods
596 Chordates
597 Cold-blooded vertebrates; fishes
598 Birds
599 Mammals
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