Classification
530 - Physics
109
523 - Specific celestial bodies & phenomena
56
520 - Astronomy & allied sciences
43
500 - Natural sciences & mathematics
25
621 - Applied physics
11
539 - Modern physics
9
333 - Economics of land & energy
7
000 - Computer science, information & general works
5
600 - Technology
5
700 - The arts; fine & decorative arts
5
531 - Classical mechanics; solid mechanics
4
576 - Genetics & evolution
4
620 - Engineering & allied operations
4
004 - Data processing & computer science
3
515 - Analysis
3
518 - Numerical analysis
3
535 - Light & infrared & ultraviolet phenomena
3
501 - Philosophy & theory
2
510 - Mathematics
2
543 - Analytical chemistry
2
629 - Other branches of engineering
2
001 - Knowledge
1
005 - Computer programming, programs & data
1
100 - Philosophy & psychology
1
300 - Social sciences
1
331 - Labor economics
1
340 - Law
1
380 - Commerce, communications & transportation
1
400 - Language
1
516 - Geometry
1
519 - Probabilities & applied mathematics
1
521 - Celestial mechanics
1
536 - Heat
1
537 - Electricity & electronics
1
540 - Chemistry & allied sciences
1
650 - Management & auxiliary services
1
780 - Music
1
791 - Public performances
1
800 - Literature & rhetoric
1
900 - History & geography
1