Classification
530 - Physics
1,240
539 - Modern physics
121
520 - Astronomy & allied sciences
115
523 - Specific celestial bodies & phenomena
71
531 - Classical mechanics; solid mechanics
53
621 - Applied physics
33
536 - Heat
32
620 - Engineering & allied operations
32
500 - Natural sciences & mathematics
31
537 - Electricity & electronics
30
538 - Magnetism
13
535 - Light & infrared & ultraviolet phenomena
12
550 - Earth sciences
10
571 - Physiology & related subjects
9
541 - Physical chemistry
8
006 - Special computer methods
5
534 - Sound & related vibrations
5
548 - Crystallography
5
501 - Philosophy & theory
4
516 - Geometry
4
515 - Analysis
3
003 - Systems
2
333 - Economics of land & energy
2
512 - Algebra
2
551 - Geology, hydrology & meteorology
2
004 - Data processing & computer science
1
005 - Computer programming, programs & data
1
526 - Mathematical geography
1
576 - Genetics & evolution
1
612 - Human physiology
1
652 - Processes of written communication
1
700 - The arts; fine & decorative arts
1