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
|
Gas
mechanics
|
534
|
Sound
& related vibrations
|
535
|
Light
¶photic 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
|
562
|
Fossil
invertebrates
|
563
|
Fossil
primitive phyla
|
564
|
Fossil
Mollusca &Molluscoidea
|
565
|
Other
fossil invertebrates
|
566
|
Fossil
Vertebrata (Fossil Craniata)
|
567
|
Fossil
cold-blooded vertebrates
|
568
|
Fossil
Aves (Fossil birds)
|
569
|
Fossil
Mammalia
|
570
|
Life
sciences
|
571
|
Not
assigned or no longer used
|
572
|
Human
races
|
573
|
Physical
anthropology
|
574
|
Biology
|
575
|
Evolution
& genetics
|
576
|
Microbiology
|
577
|
General
nature of life
|
578
|
Microscopy
in biology
|
579
|
Collection
and preservation
|
580
|
Botanical
sciences
|
581
|
Botany
|
582
|
Spermatophyta
(Seed-bearing plants)
|
583
|
Dicotyledones
|
584
|
Monocotyledones
|
585
|
Gymnospermae
(Pinophyta)
|
586
|
Cryptogamia
(Seedless plants)
|
587
|
Pteridophyta
(Vascular cryptograms)
|
588
|
Bryophyta
|
589
|
Thallobionta&Prokaryotae
|
590
|
Zoological
sciences
|
591
|
Zoology
|
592
|
Invertebrates
|
593
|
Protozoa,
Echinodermata, related phyla
|
594
|
Mollusca
&Molluscoidea
|
595
|
Other
invertebrates
|
596
|
Vertebrata
(Craniata, Vertebrates)
|
597
|
Cold-blooded
vertebrates Fishes
|
598
|
Aves
(Birds)
|
599
|
Mammalia
(Mammals)
|
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