Classification
530 - Physics
37
539 - Modern physics
30
500 - Natural sciences & mathematics
11
001 - Knowledge
8
300 - Social sciences
8
541 - Physical chemistry
7
520 - Astronomy & allied sciences
6
620 - Engineering & allied operations
5
531 - Classical mechanics; solid mechanics
2
537 - Electricity & electronics
2
621 - Applied physics
2
003 - Systems
1
333 - Economics of land & energy
1
523 - Specific celestial bodies & phenomena
1
535 - Light & infrared & ultraviolet phenomena
1
536 - Heat
1
538 - Magnetism
1
547 - Organic chemistry
1
551 - Geology, hydrology & meteorology
1
570 - Life sciences; biology
1
629 - Other branches of engineering
1