Classification
530 - Physics
77
500 - Natural sciences & mathematics
13
510 - Mathematics
13
501 - Philosophy & theory
10
520 - Astronomy & allied sciences
10
300 - Social sciences
7
620 - Engineering & allied operations
7
001 - Knowledge
6
515 - Analysis
5
900 - History & geography
5
330 - Economics
4
509 - Historical, geographic & persons treatment
4
617 - Surgery & related medical specialties
4
621 - Applied physics
4
658 - General management
4
320 - Political science
3
531 - Classical mechanics; solid mechanics
3
004 - Data processing & computer science
2
006 - Special computer methods
2
100 - Philosophy & psychology
2
120 - Epistemology, causation & humankind
2
150 - Psychology
2
153 - Mental processes & intelligence
2
511 - General principles of mathematics
2
519 - Probabilities & applied mathematics
2
523 - Specific celestial bodies & phenomena
2
537 - Electricity & electronics
2
610 - Medicine & health
2
612 - Human physiology
2
616 - Diseases
2
624 - Civil engineering
2
629 - Other branches of engineering
2
003 - Systems
1
005 - Computer programming, programs & data
1
050 - General serial publications
1
144 - Humanism & related systems
1
158 - Applied psychology
1
180 - Ancient, medieval & eastern philosophy
1
191 - Philosophy of United States & Canada
1
210 - Philosophy & theory of religion
1
306 - Culture & institutions
1
331 - Labor economics
1
332 - Financial economics
1
338 - Production
1
370 - Education
1
400 - Language
1
512 - Algebra
1
516 - Geometry
1
535 - Light & infrared & ultraviolet phenomena
1
536 - Heat
1
more ...