Classification
530 - Physics
52
520 - Astronomy & allied sciences
4
531 - Classical mechanics; solid mechanics
4
536 - Heat
3
539 - Modern physics
3
537 - Electricity & electronics
2
620 - Engineering & allied operations
2
501 - Philosophy & theory
1
523 - Specific celestial bodies & phenomena
1
541 - Physical chemistry
1
548 - Crystallography
1
621 - Applied physics
1