Classification
530 - Physics
66
539 - Modern physics
50
500 - Natural sciences & mathematics
18
333 - Economics of land & energy
10
520 - Astronomy & allied sciences
10
620 - Engineering & allied operations
10
001 - Knowledge
8
300 - Social sciences
8
541 - Physical chemistry
8
700 - The arts; fine & decorative arts
8
523 - Specific celestial bodies & phenomena
6
621 - Applied physics
4
540 - Chemistry & allied sciences
3
515 - Analysis
2
531 - Classical mechanics; solid mechanics
2
537 - Electricity & electronics
2
538 - Magnetism
2
000 - Computer science, information & general works
1
003 - Systems
1
004 - Data processing & computer science
1
363 - Other social problems & services
1
519 - Probabilities & applied mathematics
1
535 - Light & infrared & ultraviolet phenomena
1
536 - Heat
1
547 - Organic chemistry
1
551 - Geology, hydrology & meteorology
1
570 - Life sciences; biology
1
572 - Biochemistry
1
576 - Genetics & evolution
1
629 - Other branches of engineering
1
900 - History & geography
1