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 &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
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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